1371998639 has 8 divisors (see below), whose sum is σ = 1498165200. Its totient is φ = 1246072000.

The previous prime is 1371998633. The next prime is 1371998647. The reversal of 1371998639 is 9368991731.

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

It is a cyclic number.

It is not a de Polignac number, because 1371998639 - 2²⁸ = 1103563183 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 (1371998633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47912 + ... + 70989.

It is an arithmetic number, because the mean of its divisors is an integer number (187270650).

Almost surely, 2^1371998639 is an apocalyptic number.

1371998639 is a deficient number, since it is larger than the sum of its proper divisors (126166561).

1371998639 is a wasteful number, since it uses less digits than its factorization.

1371998639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119961.

The product of its digits is 2204496, while the sum is 56.

The square root of 1371998639 is about 37040.4999831266. The cubic root of 1371998639 is about 1111.1803689537.

The spelling of 1371998639 in words is "one billion, three hundred seventy-one million, nine hundred ninety-eight thousand, six hundred thirty-nine".