3953142621 has 12 divisors (see below), whose sum is σ = 5730712572. Its totient is φ = 2625912576.

The previous prime is 3953142593. The next prime is 3953142623. The reversal of 3953142621 is 1262413593.

3953142621 is a `hidden beast` number, since 395 + 3 + 1 + 4 + 262 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 458559396 + 3494583225 = 21414^2 + 59115^2 .

It is not a de Polignac number, because 3953142621 - 2¹⁴ = 3953126237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3953142623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 790356 + ... + 795341.

It is an arithmetic number, because the mean of its divisors is an integer number (477559381).

Almost surely, 2^3953142621 is an apocalyptic number.

It is an amenable number.

3953142621 is a deficient number, since it is larger than the sum of its proper divisors (1777569951).

3953142621 is a wasteful number, since it uses less digits than its factorization.

3953142621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585980 (or 1585977 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 3953142621 is about 62874.0218293692. The cubic root of 3953142621 is about 1581.1782352074.

The spelling of 3953142621 in words is "three billion, nine hundred fifty-three million, one hundred forty-two thousand, six hundred twenty-one".