39978630 has 64 divisors (see below), whose sum is σ = 107205120. Its totient is φ = 10601568.

The previous prime is 39978629. The next prime is 39978667. The reversal of 39978630 is 3687993.

It is a happy number.

39978630 is a `hidden beast` number, since 3 + 9 + 9 + 7 + 8 + 630 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70729 + ... + 71291.

It is an arithmetic number, because the mean of its divisors is an integer number (1675080).

Almost surely, 2^39978630 is an apocalyptic number.

39978630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 39978630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53602560).

39978630 is an abundant number, since it is smaller than the sum of its proper divisors (67226490).

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

39978630 is a wasteful number, since it uses less digits than its factorization.

39978630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 836 counting only the distinct ones).

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

The square root of 39978630 is about 6322.8656477898. The cubic root of 39978630 is about 341.9342748429.

The spelling of 39978630 in words is "thirty-nine million, nine hundred seventy-eight thousand, six hundred thirty".