29921969 has 12 divisors (see below), whose sum is σ = 37588992. Its totient is φ = 23315160.

The previous prime is 29921953. The next prime is 29921977. The reversal of 29921969 is 96912992.

29921969 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 29921969 - 2⁴ = 29921953 is a prime.

It is a super-2 number, since 2×29921969² = 1790648457673922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29921569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16817 + ... + 18510.

It is an arithmetic number, because the mean of its divisors is an integer number (3132416).

Almost surely, 2^29921969 is an apocalyptic number.

It is an amenable number.

29921969 is a deficient number, since it is larger than the sum of its proper divisors (7667023).

29921969 is a wasteful number, since it uses less digits than its factorization.

29921969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35356 (or 35345 counting only the distinct ones).

The product of its digits is 157464, while the sum is 47.

The square root of 29921969 is about 5470.0977139353. The cubic root of 29921969 is about 310.4536161733.

The spelling of 29921969 in words is "twenty-nine million, nine hundred twenty-one thousand, nine hundred sixty-nine".