3964521420 has 36 divisors (see below), whose sum is σ = 12025715520. Its totient is φ = 1057205664.

The previous prime is 3964521413. The next prime is 3964521427. The reversal of 3964521420 is 241254693.

It is a happy number.

3964521420 is a `hidden beast` number, since 3 + 9 + 645 + 2 + 1 + 4 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (3964521413) and next prime (3964521427).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (3964521427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11012380 + ... + 11012739.

Almost surely, 2^3964521420 is an apocalyptic number.

3964521420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3964521420 is an abundant number, since it is smaller than the sum of its proper divisors (8061194100).

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

3964521420 is a wasteful number, since it uses less digits than its factorization.

3964521420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22025134 (or 22025129 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 3964521420 is about 62964.4456816702. The cubic root of 3964521420 is about 1582.6938794976.

The spelling of 3964521420 in words is "three billion, nine hundred sixty-four million, five hundred twenty-one thousand, four hundred twenty".