1387634928 has 40 divisors (see below), whose sum is σ = 3795591888. Its totient is φ = 435336192.

The previous prime is 1387634887. The next prime is 1387634929. The reversal of 1387634928 is 8294367831.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387634929) 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, 849451 + ... + 851082.

Almost surely, 2^1387634928 is an apocalyptic number.

It is an amenable number.

1387634928 is an abundant number, since it is smaller than the sum of its proper divisors (2407956960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1387634928 is a wasteful number, since it uses less digits than its factorization.

1387634928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700561 (or 1700555 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 1387634928 is about 37250.9721752332. The cubic root of 1387634928 is about 1115.3857052724.

The spelling of 1387634928 in words is "one billion, three hundred eighty-seven million, six hundred thirty-four thousand, nine hundred twenty-eight".