7157397 has 8 divisors (see below), whose sum is σ = 10277344. Its totient is φ = 4404528.

The previous prime is 7157389. The next prime is 7157401. The reversal of 7157397 is 7937517.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7157397 - 2³ = 7157389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 183523 = 7157397 / (7 + 1 + 5 + 7 + 3 + 9 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7157377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91723 + ... + 91800.

It is an arithmetic number, because the mean of its divisors is an integer number (1284668).

Almost surely, 2^7157397 is an apocalyptic number.

It is an amenable number.

7157397 is a deficient number, since it is larger than the sum of its proper divisors (3119947).

7157397 is a wasteful number, since it uses less digits than its factorization.

7157397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183539.

The product of its digits is 46305, while the sum is 39.

The square root of 7157397 is about 2675.3311944505. The cubic root of 7157397 is about 192.7162645079.

Adding to 7157397 its sum of digits (39), we get a triangular number (7157436 = T₃₇₈₃).

The spelling of 7157397 in words is "seven million, one hundred fifty-seven thousand, three hundred ninety-seven".