1397157 has 16 divisors (see below), whose sum is σ = 1966272. Its totient is φ = 881280.

The previous prime is 1397153. The next prime is 1397159. The reversal of 1397157 is 7517931.

It is not a de Polignac number, because 1397157 - 2² = 1397153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397153) 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, 4398 + ... + 4704.

It is an arithmetic number, because the mean of its divisors is an integer number (122892).

2^1397157 is an apocalyptic number.

It is an amenable number.

1397157 is a deficient number, since it is larger than the sum of its proper divisors (569115).

1397157 is a wasteful number, since it uses less digits than its factorization.

1397157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388.

The product of its digits is 6615, while the sum is 33.

The square root of 1397157 is about 1182.0139593084. The cubic root of 1397157 is about 111.7931183047.

Subtracting from 1397157 its sum of digits (33), we obtain a square (1397124 = 1182²).

It can be divided in two parts, 13971 and 57, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 1397157 in words is "one million, three hundred ninety-seven thousand, one hundred fifty-seven".