7890421 has 12 divisors (see below), whose sum is σ = 10013760. Its totient is φ = 6147960.

The previous prime is 7890413. The next prime is 7890427. The reversal of 7890421 is 1240987.

It is not a de Polignac number, because 7890421 - 2³ = 7890413 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 (7890427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6781 + ... + 7858.

It is an arithmetic number, because the mean of its divisors is an integer number (834480).

Almost surely, 2^7890421 is an apocalyptic number.

It is an amenable number.

7890421 is a deficient number, since it is larger than the sum of its proper divisors (2123339).

7890421 is a wasteful number, since it uses less digits than its factorization.

7890421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14664 (or 14657 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 7890421 is about 2808.9893200224. The cubic root of 7890421 is about 199.0826403564.

The spelling of 7890421 in words is "seven million, eight hundred ninety thousand, four hundred twenty-one".