1397534391 has 30 divisors (see below), whose sum is σ = 2294733056. Its totient is φ = 846984600.

The previous prime is 1397534381. The next prime is 1397534429. The reversal of 1397534391 is 1934357931.

It is not a de Polignac number, because 1397534391 - 2¹⁰ = 1397533367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397534321) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 61495 + ... + 81096.

Almost surely, 2^1397534391 is an apocalyptic number.

1397534391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1397534391 is a deficient number, since it is larger than the sum of its proper divisors (897198665).

1397534391 is a wasteful number, since it uses less digits than its factorization.

1397534391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142625 (or 142605 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 1397534391 is about 37383.6112621560. The cubic root of 1397534391 is about 1118.0318300958.

The spelling of 1397534391 in words is "one billion, three hundred ninety-seven million, five hundred thirty-four thousand, three hundred ninety-one".