7963921 has 6 divisors (see below), whose sum is σ = 9264210. Its totient is φ = 6826176.

The previous prime is 7963919. The next prime is 7963937. The reversal of 7963921 is 1293697.

It can be written as a sum of positive squares in only one way, i.e., 6890625 + 1073296 = 2625^2 + 1036^2 .

It is not a de Polignac number, because 7963921 - 2¹ = 7963919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7963961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81216 + ... + 81313.

It is an arithmetic number, because the mean of its divisors is an integer number (1544035).

Almost surely, 2^7963921 is an apocalyptic number.

It is an amenable number.

7963921 is a deficient number, since it is larger than the sum of its proper divisors (1300289).

7963921 is a wasteful number, since it uses less digits than its factorization.

7963921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162543 (or 162536 counting only the distinct ones).

The product of its digits is 20412, while the sum is 37.

The square root of 7963921 is about 2822.0419911830. The cubic root of 7963921 is about 199.6988885537.

It can be divided in two parts, 79 and 63921, that added together give a cube (64000 = 40³).

The spelling of 7963921 in words is "seven million, nine hundred sixty-three thousand, nine hundred twenty-one".