1387996506 has 32 divisors (see below), whose sum is σ = 3321702720. Its totient is φ = 427075632.

The previous prime is 1387996471. The next prime is 1387996529. The reversal of 1387996506 is 6056997831.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 987900 + ... + 989303.

It is an arithmetic number, because the mean of its divisors is an integer number (103803210).

Almost surely, 2^1387996506 is an apocalyptic number.

1387996506 is an abundant number, since it is smaller than the sum of its proper divisors (1933706214).

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

1387996506 is a wasteful number, since it uses less digits than its factorization.

1387996506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977227 (or 1977221 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 1387996506 is about 37255.8251284279. The cubic root of 1387996506 is about 1115.4825760703.

The spelling of 1387996506 in words is "one billion, three hundred eighty-seven million, nine hundred ninety-six thousand, five hundred six".