29979987 has 16 divisors (see below), whose sum is σ = 41099520. Its totient is φ = 19428192.

The previous prime is 29979977. The next prime is 29980003. The reversal of 29979987 is 78997992.

It is a happy number.

It is not a de Polignac number, because 29979987 - 2²⁰ = 28931411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29979987.

It is not an unprimeable number, because it can be changed into a prime (29979907) 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, 35314 + ... + 36152.

It is an arithmetic number, because the mean of its divisors is an integer number (2568720).

Almost surely, 2^29979987 is an apocalyptic number.

29979987 is a deficient number, since it is larger than the sum of its proper divisors (11119533).

29979987 is a wasteful number, since it uses less digits than its factorization.

29979987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its digits is 5143824, while the sum is 60.

The square root of 29979987 is about 5475.3983416734. The cubic root of 29979987 is about 310.6541407319.

The spelling of 29979987 in words is "twenty-nine million, nine hundred seventy-nine thousand, nine hundred eighty-seven".