29628921 has 16 divisors (see below), whose sum is σ = 45318528. Its totient is φ = 16867200.

The previous prime is 29628919. The next prime is 29628953. The reversal of 29628921 is 12982692.

It is not a de Polignac number, because 29628921 - 2¹ = 29628919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29628921.

It is not an unprimeable number, because it can be changed into a prime (29628121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3391 + ... + 8411.

It is an arithmetic number, because the mean of its divisors is an integer number (2832408).

Almost surely, 2^29628921 is an apocalyptic number.

29628921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

29628921 is a deficient number, since it is larger than the sum of its proper divisors (15689607).

29628921 is a wasteful number, since it uses less digits than its factorization.

29628921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5312.

The product of its digits is 31104, while the sum is 39.

The square root of 29628921 is about 5443.2454473411. The cubic root of 29628921 is about 309.4367886790.

The spelling of 29628921 in words is "twenty-nine million, six hundred twenty-eight thousand, nine hundred twenty-one".