1387329990 has 32 divisors (see below), whose sum is σ = 3332482560. Its totient is φ = 369633504.

The previous prime is 1387329971. The next prime is 1387330039. The reversal of 1387329990 is 999237831.

It is a happy number.

1387329990 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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, 16131 + ... + 55089.

It is an arithmetic number, because the mean of its divisors is an integer number (104140080).

Almost surely, 2^1387329990 is an apocalyptic number.

1387329990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387329990 is an abundant number, since it is smaller than the sum of its proper divisors (1945152570).

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

1387329990 is a wasteful number, since it uses less digits than its factorization.

1387329990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40156.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 1387329990 is about 37246.8789296499. The cubic root of 1387329990 is about 1115.3039958840.

The spelling of 1387329990 in words is "one billion, three hundred eighty-seven million, three hundred twenty-nine thousand, nine hundred ninety".