Search a number
79421 = 431847
BaseRepresentation
bin10011011000111101
311000221112
4103120331
510020141
61411405
7450356
oct233075
9130845
1079421
1154741
1239b65
132a1c4
1420d2d
15187eb
hex1363d

79421 has 4 divisors (see below), whose sum is σ = 81312. Its totient is φ = 77532.

The previous prime is 79411. The next prime is 79423. The reversal of 79421 is 12497.

79421 = T38 + T39 + ... + T80.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79421 - 26 = 79357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79423) 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, 881 + ... + 966.

It is an arithmetic number, because the mean of its divisors is an integer number (20328).

279421 is an apocalyptic number.

It is an amenable number.

79421 is a deficient number, since it is larger than the sum of its proper divisors (1891).

79421 is a wasteful number, since it uses less digits than its factorization.

79421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890.

The product of its digits is 504, while the sum is 23.

The square root of 79421 is about 281.8173167142. The cubic root of 79421 is about 42.9844905307.

The spelling of 79421 in words is "seventy-nine thousand, four hundred twenty-one".

Divisors: 1 43 1847 79421