29681900 has 18 divisors (see below), whose sum is σ = 64409940. Its totient is φ = 11872720.

The previous prime is 29681893. The next prime is 29681941. The reversal of 29681900 is 918692.

It is a super-2 number, since 2×29681900² = 1762030375220000, which contains 22 as substring.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 148310 + ... + 148509.

It is an arithmetic number, because the mean of its divisors is an integer number (3578330).

Almost surely, 2^29681900 is an apocalyptic number.

29681900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29681900 is an abundant number, since it is smaller than the sum of its proper divisors (34728040).

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

29681900 is a wasteful number, since it uses less digits than its factorization.

29681900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296833 (or 296826 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 29681900 is about 5448.1097639457. The cubic root of 29681900 is about 309.6211118526.

The spelling of 29681900 in words is "twenty-nine million, six hundred eighty-one thousand, nine hundred".