29691972 has 18 divisors (see below), whose sum is σ = 75054798. Its totient is φ = 9897312.

The previous prime is 29691967. The next prime is 29691989. The reversal of 29691972 is 27919692.

It can be written as a sum of positive squares in only one way, i.e., 21013056 + 8678916 = 4584^2 + 2946^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×29691972² = 1763226402497568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 412353 + ... + 412424.

It is an arithmetic number, because the mean of its divisors is an integer number (4169711).

Almost surely, 2^29691972 is an apocalyptic number.

It is an amenable number.

29691972 is an abundant number, since it is smaller than the sum of its proper divisors (45362826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29691972 is a wasteful number, since it uses less digits than its factorization.

29691972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824787 (or 824782 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 29691972 is about 5449.0340428373. The cubic root of 29691972 is about 309.6561292781.

The spelling of 29691972 in words is "twenty-nine million, six hundred ninety-one thousand, nine hundred seventy-two".