1387656 has 24 divisors (see below), whose sum is σ = 3758430. Its totient is φ = 462528.

The previous prime is 1387649. The next prime is 1387667. The reversal of 1387656 is 6567831.

It can be written as a sum of positive squares in only one way, i.e., 1102500 + 285156 = 1050^2 + 534^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1387656.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9565 + ... + 9708.

2^1387656 is an apocalyptic number.

It is an amenable number.

1387656 is an abundant number, since it is smaller than the sum of its proper divisors (2370774).

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

1387656 is a wasteful number, since it uses less digits than its factorization.

1387656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19285 (or 19278 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 1387656 is about 1177.9881153900. The cubic root of 1387656 is about 111.5391351159.

The spelling of 1387656 in words is "one million, three hundred eighty-seven thousand, six hundred fifty-six".