39978460 has 12 divisors (see below), whose sum is σ = 83954808. Its totient is φ = 15991376.

The previous prime is 39978409. The next prime is 39978473. The reversal of 39978460 is 6487993.

It is a self number, because there is not a number n which added to its sum of digits gives 39978460.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 999442 + ... + 999481.

It is an arithmetic number, because the mean of its divisors is an integer number (6996234).

Almost surely, 2^39978460 is an apocalyptic number.

It is an amenable number.

39978460 is an abundant number, since it is smaller than the sum of its proper divisors (43976348).

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

39978460 is a wasteful number, since it uses less digits than its factorization.

39978460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998932 (or 1998930 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 39978460 is about 6322.8522045039. The cubic root of 39978460 is about 341.9337901764.

The spelling of 39978460 in words is "thirty-nine million, nine hundred seventy-eight thousand, four hundred sixty".