400038203640 has 32 divisors (see below), whose sum is σ = 1200114611280. Its totient is φ = 106676854272.

The previous prime is 400038203639. The next prime is 400038203657. The reversal of 400038203640 is 46302830004.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 400038203598 and 400038203607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1666825729 + ... + 1666825968.

Almost surely, 2^400038203640 is an apocalyptic number.

400038203640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400038203640 is an abundant number, since it is smaller than the sum of its proper divisors (800076407640).

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

400038203640 is a wasteful number, since it uses less digits than its factorization.

400038203640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333651711 (or 3333651707 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The spelling of 400038203640 in words is "four hundred billion, thirty-eight million, two hundred three thousand, six hundred forty".