7923640 has 16 divisors (see below), whose sum is σ = 17828280. Its totient is φ = 3169440.

The previous prime is 7923623. The next prime is 7923647. The reversal of 7923640 is 463297.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7923647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99006 + ... + 99085.

Almost surely, 2^7923640 is an apocalyptic number.

It is an amenable number.

7923640 is an abundant number, since it is smaller than the sum of its proper divisors (9904640).

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

7923640 is a wasteful number, since it uses less digits than its factorization.

7923640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198102 (or 198098 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 7923640 is about 2814.8960904445. The cubic root of 7923640 is about 199.3616312613.

The spelling of 7923640 in words is "seven million, nine hundred twenty-three thousand, six hundred forty".