1387645432 has 16 divisors (see below), whose sum is σ = 2662343640. Its totient is φ = 677687136.

The previous prime is 1387645429. The next prime is 1387645433. The reversal of 1387645432 is 2345467831.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387645433) by changing a digit.

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, 2016583 + ... + 2017270.

Almost surely, 2^1387645432 is an apocalyptic number.

It is an amenable number.

1387645432 is a deficient number, since it is larger than the sum of its proper divisors (1274698208).

1387645432 is a wasteful number, since it uses less digits than its factorization.

1387645432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033902 (or 4033898 counting only the distinct ones).

The product of its digits is 483840, while the sum is 43.

The square root of 1387645432 is about 37251.1131645754. The cubic root of 1387645432 is about 1115.3885196490.

The spelling of 1387645432 in words is "one billion, three hundred eighty-seven million, six hundred forty-five thousand, four hundred thirty-two".