1387992 has 32 divisors (see below), whose sum is σ = 3502080. Its totient is φ = 458400.

The previous prime is 1387987. The next prime is 1388003. The reversal of 1387992 is 2997831.

It is a self number, because there is not a number n which added to its sum of digits gives 1387992.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3433 + ... + 3815.

It is an arithmetic number, because the mean of its divisors is an integer number (109440).

2^1387992 is an apocalyptic number.

1387992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1387992 is an abundant number, since it is smaller than the sum of its proper divisors (2114088).

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

1387992 is a wasteful number, since it uses less digits than its factorization.

1387992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 539 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 1387992 is about 1178.1307227978. The cubic root of 1387992 is about 111.5481368966.

The spelling of 1387992 in words is "one million, three hundred eighty-seven thousand, nine hundred ninety-two".