1397744871 has 8 divisors (see below), whose sum is σ = 1927924080. Its totient is φ = 899697792.

The previous prime is 1397744857. The next prime is 1397744897. The reversal of 1397744871 is 1784477931.

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

It is a de Polignac number, because none of the positive numbers 2^k-1397744871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397744851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8032930 + ... + 8033103.

It is an arithmetic number, because the mean of its divisors is an integer number (240990510).

Almost surely, 2^1397744871 is an apocalyptic number.

1397744871 is a deficient number, since it is larger than the sum of its proper divisors (530179209).

1397744871 is a wasteful number, since it uses less digits than its factorization.

1397744871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16066065.

The product of its digits is 1185408, while the sum is 51.

The square root of 1397744871 is about 37386.4262935093. The cubic root of 1397744871 is about 1118.0879554949.

The spelling of 1397744871 in words is "one billion, three hundred ninety-seven million, seven hundred forty-four thousand, eight hundred seventy-one".