7957421 has 8 divisors (see below), whose sum is σ = 8262144. Its totient is φ = 7655760.

The previous prime is 7957393. The next prime is 7957423. The reversal of 7957421 is 1247597.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-7957421 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 (7957423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5456 + ... + 6758.

It is an arithmetic number, because the mean of its divisors is an integer number (1032768).

Almost surely, 2^7957421 is an apocalyptic number.

It is an amenable number.

7957421 is a deficient number, since it is larger than the sum of its proper divisors (304723).

7957421 is a wasteful number, since it uses less digits than its factorization.

7957421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531.

The product of its digits is 17640, while the sum is 35.

The square root of 7957421 is about 2820.8901077497. The cubic root of 7957421 is about 199.6445436281.

The spelling of 7957421 in words is "seven million, nine hundred fifty-seven thousand, four hundred twenty-one".