3918462021 has 8 divisors (see below), whose sum is σ = 5805128960. Its totient is φ = 2612307996.

The previous prime is 3918462019. The next prime is 3918462029. The reversal of 3918462021 is 1202648193.

3918462021 is a `hidden beast` number, since 3 + 9 + 1 + 8 + 4 + 620 + 21 = 666.

It is not a de Polignac number, because 3918462021 - 2¹ = 3918462019 is a prime.

It is a super-2 number, since 2×3918462021² = 30708689220038808882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3918462029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72564085 + ... + 72564138.

It is an arithmetic number, because the mean of its divisors is an integer number (725641120).

Almost surely, 2^3918462021 is an apocalyptic number.

It is an amenable number.

3918462021 is a deficient number, since it is larger than the sum of its proper divisors (1886666939).

3918462021 is a wasteful number, since it uses less digits than its factorization.

3918462021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145128232 (or 145128226 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 3918462021 is about 62597.6199307929. The cubic root of 3918462021 is about 1576.5407978390.

The spelling of 3918462021 in words is "three billion, nine hundred eighteen million, four hundred sixty-two thousand, twenty-one".