3954831021 has 16 divisors (see below), whose sum is σ = 5894960320. Its totient is φ = 2620375920.

The previous prime is 3954830993. The next prime is 3954831029. The reversal of 3954831021 is 1201384593.

3954831021 is a `hidden beast` number, since 3 + 9 + 548 + 3 + 102 + 1 = 666.

It is not a de Polignac number, because 3954831021 - 2¹⁴ = 3954814637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3954831029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444910 + ... + 453711.

It is an arithmetic number, because the mean of its divisors is an integer number (368435020).

Almost surely, 2^3954831021 is an apocalyptic number.

It is an amenable number.

3954831021 is a deficient number, since it is larger than the sum of its proper divisors (1940129299).

3954831021 is a wasteful number, since it uses less digits than its factorization.

3954831021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898793 (or 898787 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 3954831021 is about 62887.4472450584. The cubic root of 3954831021 is about 1581.4033119463.

The spelling of 3954831021 in words is "three billion, nine hundred fifty-four million, eight hundred thirty-one thousand, twenty-one".