1397523397 has 4 divisors (see below), whose sum is σ = 1471077280. Its totient is φ = 1323969516.

The previous prime is 1397523389. The next prime is 1397523419. The reversal of 1397523397 is 7933257931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7933257931 = 1699 ⋅4669369.

It is a cyclic number.

It is not a de Polignac number, because 1397523397 - 2³ = 1397523389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1397523397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397523377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36776913 + ... + 36776950.

It is an arithmetic number, because the mean of its divisors is an integer number (367769320).

Almost surely, 2^1397523397 is an apocalyptic number.

It is an amenable number.

1397523397 is a deficient number, since it is larger than the sum of its proper divisors (73553883).

1397523397 is an equidigital number, since it uses as much as digits as its factorization.

1397523397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73553882.

The product of its digits is 1071630, while the sum is 49.

The square root of 1397523397 is about 37383.4642188227. The cubic root of 1397523397 is about 1118.0288983434.

The spelling of 1397523397 in words is "one billion, three hundred ninety-seven million, five hundred twenty-three thousand, three hundred ninety-seven".