39630978 has 64 divisors (see below), whose sum is σ = 97355520. Its totient is φ = 11886336.

The previous prime is 39630971. The next prime is 39630991. The reversal of 39630978 is 87903693.

It is a happy number.

39630978 is a `hidden beast` number, since 3 + 9 + 630 + 9 + 7 + 8 = 666.

It is a super-2 number, since 2×39630978² = 3141228834472968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39630971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20176 + ... + 22052.

It is an arithmetic number, because the mean of its divisors is an integer number (1521180).

Almost surely, 2^39630978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39630978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48677760).

39630978 is an abundant number, since it is smaller than the sum of its proper divisors (57724542).

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

39630978 is a wasteful number, since it uses less digits than its factorization.

39630978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928 (or 1922 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 39630978 is about 6295.3139715188. The cubic root of 39630978 is about 340.9402405864.

The spelling of 39630978 in words is "thirty-nine million, six hundred thirty thousand, nine hundred seventy-eight".