29799981 has 20 divisors (see below), whose sum is σ = 44802912. Its totient is φ = 19738728.

The previous prime is 29799977. The next prime is 29799983. The reversal of 29799981 is 18999792.

It is not a de Polignac number, because 29799981 - 2² = 29799977 is a prime.

It is a super-2 number, since 2×29799981² = 1776077735200722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29799983) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12426 + ... + 14628.

Almost surely, 2^29799981 is an apocalyptic number.

It is an amenable number.

29799981 is a deficient number, since it is larger than the sum of its proper divisors (15002931).

29799981 is a wasteful number, since it uses less digits than its factorization.

29799981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382 (or 2373 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 29799981 is about 5458.9358853168. The cubic root of 29799981 is about 310.0311484484.

The spelling of 29799981 in words is "twenty-nine million, seven hundred ninety-nine thousand, nine hundred eighty-one".