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29420821 = 41717581
BaseRepresentation
bin111000000111…
…0110100010101
32001100201210001
41300032310111
530012431241
62530331301
7505033663
oct160166425
961321701
1029420821
1115675331
129a29b31
136131491
143c9bc33
1528b2431
hex1c0ed15

29420821 has 4 divisors (see below), whose sum is σ = 30138444. Its totient is φ = 28703200.

The previous prime is 29420813. The next prime is 29420843. The reversal of 29420821 is 12802492.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2235025 + 27185796 = 1495^2 + 5214^2 .

It is a cyclic number.

It is not a de Polignac number, because 29420821 - 23 = 29420813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29420821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29420801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358750 + ... + 358831.

It is an arithmetic number, because the mean of its divisors is an integer number (7534611).

Almost surely, 229420821 is an apocalyptic number.

It is an amenable number.

29420821 is a deficient number, since it is larger than the sum of its proper divisors (717623).

29420821 is an equidigital number, since it uses as much as digits as its factorization.

29420821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717622.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 29420821 is about 5424.0963302655. The cubic root of 29420821 is about 308.7106384391.

It can be divided in two parts, 294 and 20821, that added together give a triangular number (21115 = T205).

The spelling of 29420821 in words is "twenty-nine million, four hundred twenty thousand, eight hundred twenty-one".

Divisors: 1 41 717581 29420821