1513638387 has 8 divisors (see below), whose sum is σ = 2242427280. Its totient is φ = 1009092240.

The previous prime is 1513638361. The next prime is 1513638389. The reversal of 1513638387 is 7838363151.

1513638387 is a `hidden beast` number, since 1 + 5 + 1 + 3 + 638 + 3 + 8 + 7 = 666.

1513638387 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 1513638387 - 2¹⁸ = 1513376243 is a prime.

It is a super-2 number, since 2×1513638387² = 4582202333199923538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1513638389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28030314 + ... + 28030367.

It is an arithmetic number, because the mean of its divisors is an integer number (280303410).

Almost surely, 2^1513638387 is an apocalyptic number.

1513638387 is a deficient number, since it is larger than the sum of its proper divisors (728788893).

1513638387 is an equidigital number, since it uses as much as digits as its factorization.

1513638387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56060690 (or 56060684 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1513638387 is about 38905.5058699922. The cubic root of 1513638387 is about 1148.1731263604.

The spelling of 1513638387 in words is "one billion, five hundred thirteen million, six hundred thirty-eight thousand, three hundred eighty-seven".