1387673631 has 12 divisors (see below), whose sum is σ = 2029790880. Its totient is φ = 913404960.

The previous prime is 1387673627. The next prime is 1387673647. The reversal of 1387673631 is 1363767831.

It is a happy number.

1387673631 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 6 + 7 + 3 + 631 = 666.

1387673631 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1387673631 - 2² = 1387673627 is a prime.

It is a super-2 number, since 2×1387673631² = 3851276212345448322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387673611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 975150 + ... + 976571.

It is an arithmetic number, because the mean of its divisors is an integer number (169149240).

Almost surely, 2^1387673631 is an apocalyptic number.

1387673631 is a deficient number, since it is larger than the sum of its proper divisors (642117249).

1387673631 is a wasteful number, since it uses less digits than its factorization.

1387673631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951806 (or 1951803 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 1387673631 is about 37251.4916614087. The cubic root of 1387673631 is about 1115.3960750439.

The spelling of 1387673631 in words is "one billion, three hundred eighty-seven million, six hundred seventy-three thousand, six hundred thirty-one".