1387890428 has 12 divisors (see below), whose sum is σ = 2429080920. Its totient is φ = 693867312.

The previous prime is 1387890409. The next prime is 1387890433. The reversal of 1387890428 is 8240987831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42575 + ... + 67737.

It is an arithmetic number, because the mean of its divisors is an integer number (202423410).

Almost surely, 2^1387890428 is an apocalyptic number.

It is an amenable number.

1387890428 is a deficient number, since it is larger than the sum of its proper divisors (1041190492).

1387890428 is a wasteful number, since it uses less digits than its factorization.

1387890428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38956 (or 38954 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 1387890428 is about 37254.4014580828. The cubic root of 1387890428 is about 1115.4541583294.

The spelling of 1387890428 in words is "one billion, three hundred eighty-seven million, eight hundred ninety thousand, four hundred twenty-eight".