39429978 has 32 divisors (see below), whose sum is σ = 94871040. Its totient is φ = 10672560.

The previous prime is 39429977. The next prime is 39429979. The reversal of 39429978 is 87992493.

It is an interprime number because it is at equal distance from previous prime (39429977) and next prime (39429979).

It is a self number, because there is not a number n which added to its sum of digits gives 39429978.

It is not an unprimeable number, because it can be changed into a prime (39429977) 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, 23908 + ... + 25503.

It is an arithmetic number, because the mean of its divisors is an integer number (2964720).

Almost surely, 2^39429978 is an apocalyptic number.

39429978 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

39429978 is an abundant number, since it is smaller than the sum of its proper divisors (55441062).

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

39429978 is a wasteful number, since it uses less digits than its factorization.

39429978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49442.

The product of its digits is 979776, while the sum is 51.

The square root of 39429978 is about 6279.3294227967. The cubic root of 39429978 is about 340.3628709440.

The spelling of 39429978 in words is "thirty-nine million, four hundred twenty-nine thousand, nine hundred seventy-eight".