1387921927 has 6 divisors (see below), whose sum is σ = 1586309144. Its totient is φ = 1189562880.

The previous prime is 1387921903. The next prime is 1387921949. The reversal of 1387921927 is 7291297831.

It is not a de Polignac number, because 1387921927 - 2²³ = 1379533319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387921957) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91527 + ... + 105607.

Almost surely, 2^1387921927 is an apocalyptic number.

1387921927 is a deficient number, since it is larger than the sum of its proper divisors (198387217).

1387921927 is an frugal number, since it uses more digits than its factorization.

1387921927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28169 (or 14088 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 1387921927 is about 37254.8242111005. The cubic root of 1387921927 is about 1115.4625968978.

The spelling of 1387921927 in words is "one billion, three hundred eighty-seven million, nine hundred twenty-one thousand, nine hundred twenty-seven".