7521397 has 16 divisors (see below), whose sum is σ = 8767360. Its totient is φ = 6391872.

The previous prime is 7521383. The next prime is 7521407. The reversal of 7521397 is 7931257.

It is a cyclic number.

It is not a de Polignac number, because 7521397 - 2¹⁵ = 7488629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7521307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8728 + ... + 9550.

It is an arithmetic number, because the mean of its divisors is an integer number (547960).

Almost surely, 2^7521397 is an apocalyptic number.

It is an amenable number.

7521397 is a deficient number, since it is larger than the sum of its proper divisors (1245963).

7521397 is a wasteful number, since it uses less digits than its factorization.

7521397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892.

The product of its digits is 13230, while the sum is 34.

The square root of 7521397 is about 2742.5165450732. The cubic root of 7521397 is about 195.9293529227.

The spelling of 7521397 in words is "seven million, five hundred twenty-one thousand, three hundred ninety-seven".