3971838456 has 32 divisors (see below), whose sum is σ = 11032885200. Its totient is φ = 1323946080.

The previous prime is 3971838439. The next prime is 3971838473. The reversal of 3971838456 is 6548381793.

3971838456 is a `hidden beast` number, since 3 + 9 + 7 + 183 + 8 + 456 = 666.

It is an interprime number because it is at equal distance from previous prime (3971838439) and next prime (3971838473).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 9193855 + ... + 9194286.

Almost surely, 2^3971838456 is an apocalyptic number.

3971838456 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3971838456 is an abundant number, since it is smaller than the sum of its proper divisors (7061046744).

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

3971838456 is a wasteful number, since it uses less digits than its factorization.

3971838456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18388156 (or 18388146 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 3971838456 is about 63022.5234023520. The cubic root of 3971838456 is about 1583.6669697018. Note that the first 3 decimals are identical.

The spelling of 3971838456 in words is "three billion, nine hundred seventy-one million, eight hundred thirty-eight thousand, four hundred fifty-six".