40019864 has 16 divisors (see below), whose sum is σ = 75107400. Its totient is φ = 19991232.

The previous prime is 40019851. The next prime is 40019869. The reversal of 40019864 is 46891004.

It is a self number, because there is not a number n which added to its sum of digits gives 40019864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40019869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11747 + ... + 14765.

Almost surely, 2^40019864 is an apocalyptic number.

It is an amenable number.

40019864 is a deficient number, since it is larger than the sum of its proper divisors (35087536).

40019864 is a wasteful number, since it uses less digits than its factorization.

40019864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682 (or 4678 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 40019864 is about 6326.1255125076. The cubic root of 40019864 is about 342.0517915705.

The spelling of 40019864 in words is "forty million, nineteen thousand, eight hundred sixty-four".