7220390 has 16 divisors (see below), whose sum is σ = 13562208. Its totient is φ = 2762496.

The previous prime is 7220383. The next prime is 7220407. The reversal of 7220390 is 930227.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15467 + ... + 15926.

It is an arithmetic number, because the mean of its divisors is an integer number (847638).

Almost surely, 2^7220390 is an apocalyptic number.

7220390 is a deficient number, since it is larger than the sum of its proper divisors (6341818).

7220390 is a wasteful number, since it uses less digits than its factorization.

7220390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31423.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 7220390 is about 2687.0783390143. The cubic root of 7220390 is about 193.2799859415.

The spelling of 7220390 in words is "seven million, two hundred twenty thousand, three hundred ninety".