29978157 has 16 divisors (see below), whose sum is σ = 46170432. Its totient is φ = 17099520.

The previous prime is 29978129. The next prime is 29978159. The reversal of 29978157 is 75187992.

It is not a de Polignac number, because 29978157 - 2¹⁶ = 29912621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29978159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26158 + ... + 27279.

It is an arithmetic number, because the mean of its divisors is an integer number (2885652).

Almost surely, 2^29978157 is an apocalyptic number.

It is an amenable number.

29978157 is a deficient number, since it is larger than the sum of its proper divisors (16192275).

29978157 is a wasteful number, since it uses less digits than its factorization.

29978157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53468.

The product of its digits is 317520, while the sum is 48.

The square root of 29978157 is about 5475.2312279939. The cubic root of 29978157 is about 310.6478197524.

It can be divided in two parts, 29978 and 157, that added together give a triangular number (30135 = T₂₄₅).

The spelling of 29978157 in words is "twenty-nine million, nine hundred seventy-eight thousand, one hundred fifty-seven".