7991402 has 12 divisors (see below), whose sum is σ = 12134850. Its totient is φ = 3947016.

The previous prime is 7991369. The next prime is 7991407. The reversal of 7991402 is 2041997.

It can be written as a sum of positive squares in only one way, i.e., 6056521 + 1934881 = 2461^2 + 1391^2 .

It is not an unprimeable number, because it can be changed into a prime (7991407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22724 + ... + 23072.

Almost surely, 2^7991402 is an apocalyptic number.

7991402 is a deficient number, since it is larger than the sum of its proper divisors (4143448).

7991402 is a wasteful number, since it uses less digits than its factorization.

7991402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 7991402 is about 2826.9067901153. The cubic root of 7991402 is about 199.9283243161.

The spelling of 7991402 in words is "seven million, nine hundred ninety-one thousand, four hundred two".