1387387544 has 32 divisors (see below), whose sum is σ = 2759177520. Its totient is φ = 651749376.

The previous prime is 1387387489. The next prime is 1387387553. The reversal of 1387387544 is 4457837831.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1387387492 and 1387387501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72047 + ... + 89249.

Almost surely, 2^1387387544 is an apocalyptic number.

It is an amenable number.

1387387544 is a deficient number, since it is larger than the sum of its proper divisors (1371789976).

1387387544 is a wasteful number, since it uses less digits than its factorization.

1387387544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17819 (or 17815 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 50.

The square root of 1387387544 is about 37247.6515232840. The cubic root of 1387387544 is about 1115.3194186311.

The spelling of 1387387544 in words is "one billion, three hundred eighty-seven million, three hundred eighty-seven thousand, five hundred forty-four".