1387521072 has 60 divisors (see below), whose sum is σ = 4437868240. Its totient is φ = 396434304.

The previous prime is 1387521061. The next prime is 1387521073. The reversal of 1387521072 is 2701257831.

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

It is not an unprimeable number, because it can be changed into a prime (1387521073) 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, 687247 + ... + 689262.

Almost surely, 2^1387521072 is an apocalyptic number.

1387521072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1387521072 is an abundant number, since it is smaller than the sum of its proper divisors (3050347168).

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

1387521072 is a wasteful number, since it uses less digits than its factorization.

1387521072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376530 (or 1376521 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 1387521072 is about 37249.4439153123. The cubic root of 1387521072 is about 1115.3551984905.

The spelling of 1387521072 in words is "one billion, three hundred eighty-seven million, five hundred twenty-one thousand, seventy-two".