7397820 has 72 divisors (see below), whose sum is σ = 22787856. Its totient is φ = 1942272.

The previous prime is 7397801. The next prime is 7397851. The reversal of 7397820 is 287937.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12859 + ... + 13421.

It is an arithmetic number, because the mean of its divisors is an integer number (316498).

Almost surely, 2^7397820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7397820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11393928).

7397820 is an abundant number, since it is smaller than the sum of its proper divisors (15390036).

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

7397820 is a wasteful number, since it uses less digits than its factorization.

7397820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 7397820 is about 2719.8933802633. The cubic root of 7397820 is about 194.8503783227.

The spelling of 7397820 in words is "seven million, three hundred ninety-seven thousand, eight hundred twenty".