1538640459 has 12 divisors (see below), whose sum is σ = 2232449856. Its totient is φ = 1021159152.

The previous prime is 1538640427. The next prime is 1538640469. The reversal of 1538640459 is 9540468351.

1538640459 is a `hidden beast` number, since 1 + 538 + 64 + 0 + 4 + 59 = 666.

It is not a de Polignac number, because 1538640459 - 2⁵ = 1538640427 is a prime.

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 not an unprimeable number, because it can be changed into a prime (1538640469) 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, 381312 + ... + 385325.

It is an arithmetic number, because the mean of its divisors is an integer number (186037488).

Almost surely, 2^1538640459 is an apocalyptic number.

1538640459 is a deficient number, since it is larger than the sum of its proper divisors (693809397).

1538640459 is a wasteful number, since it uses less digits than its factorization.

1538640459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766866 (or 766863 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 1538640459 is about 39225.5077596199. The cubic root of 1538640459 is about 1154.4604237422.

The spelling of 1538640459 in words is "one billion, five hundred thirty-eight million, six hundred forty thousand, four hundred fifty-nine".