1397873871 has 12 divisors (see below), whose sum is σ = 2125422520. Its totient is φ = 882867600.

The previous prime is 1397873849. The next prime is 1397873881. The reversal of 1397873871 is 1783787931.

It is a happy number.

It is not a de Polignac number, because 1397873871 - 2¹¹ = 1397871823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397873821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4087180 + ... + 4087521.

Almost surely, 2^1397873871 is an apocalyptic number.

1397873871 is a deficient number, since it is larger than the sum of its proper divisors (727548649).

1397873871 is a wasteful number, since it uses less digits than its factorization.

1397873871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8174726 (or 8174723 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

The square root of 1397873871 is about 37388.1514787773. The cubic root of 1397873871 is about 1118.1223511161.

The spelling of 1397873871 in words is "one billion, three hundred ninety-seven million, eight hundred seventy-three thousand, eight hundred seventy-one".