1387399512 has 64 divisors (see below), whose sum is σ = 3677119200. Its totient is φ = 434718720.

The previous prime is 1387399493. The next prime is 1387399523. The reversal of 1387399512 is 2159937831.

It is a congruent number.

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, 434562 + ... + 437742.

Almost surely, 2^1387399512 is an apocalyptic number.

1387399512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387399512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1838559600).

1387399512 is an abundant number, since it is smaller than the sum of its proper divisors (2289719688).

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

1387399512 is a wasteful number, since it uses less digits than its factorization.

1387399512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4276 (or 4272 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 1387399512 is about 37247.8121773615. The cubic root of 1387399512 is about 1115.3226256428.

The spelling of 1387399512 in words is "one billion, three hundred eighty-seven million, three hundred ninety-nine thousand, five hundred twelve".