1397134393 has 4 divisors (see below), whose sum is σ = 1434894820. Its totient is φ = 1359373968.

The previous prime is 1397134369. The next prime is 1397134399. The reversal of 1397134393 is 3934317931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3934317931 = 193 ⋅20385067.

It can be written as a sum of positive squares in 2 ways, for example, as 1224790009 + 172344384 = 34997^2 + 13128^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397134393 - 2²⁵ = 1363579961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397134399) 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, 18880158 + ... + 18880231.

It is an arithmetic number, because the mean of its divisors is an integer number (358723705).

Almost surely, 2^1397134393 is an apocalyptic number.

It is an amenable number.

1397134393 is a deficient number, since it is larger than the sum of its proper divisors (37760427).

1397134393 is an equidigital number, since it uses as much as digits as its factorization.

1397134393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37760426.

The product of its digits is 183708, while the sum is 43.

The square root of 1397134393 is about 37378.2609681082. The cubic root of 1397134393 is about 1117.9251533723.

The spelling of 1397134393 in words is "one billion, three hundred ninety-seven million, one hundred thirty-four thousand, three hundred ninety-three".