7972421 has 4 divisors (see below), whose sum is σ = 8319072. Its totient is φ = 7625772.

The previous prime is 7972417. The next prime is 7972429. The reversal of 7972421 is 1242797.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7972421 - 2² = 7972417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7972429) 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, 173291 + ... + 173336.

It is an arithmetic number, because the mean of its divisors is an integer number (2079768).

Almost surely, 2^7972421 is an apocalyptic number.

It is an amenable number.

7972421 is a deficient number, since it is larger than the sum of its proper divisors (346651).

7972421 is a wasteful number, since it uses less digits than its factorization.

7972421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346650.

The product of its digits is 7056, while the sum is 32.

The square root of 7972421 is about 2823.5475912405. The cubic root of 7972421 is about 199.7699103954.

The spelling of 7972421 in words is "seven million, nine hundred seventy-two thousand, four hundred twenty-one".