1538604140 has 12 divisors (see below), whose sum is σ = 3231068736. Its totient is φ = 615441648.

The previous prime is 1538604139. The next prime is 1538604149. The reversal of 1538604140 is 414068351.

It is a junction number, because it is equal to n+sod(n) for n = 1538604097 and 1538604106.

It is not an unprimeable number, because it can be changed into a prime (1538604149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38465084 + ... + 38465123.

It is an arithmetic number, because the mean of its divisors is an integer number (269255728).

Almost surely, 2^1538604140 is an apocalyptic number.

1538604140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1538604140 is an abundant number, since it is smaller than the sum of its proper divisors (1692464596).

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

1538604140 is a wasteful number, since it uses less digits than its factorization.

1538604140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76930216 (or 76930214 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1538604140 is about 39225.0448055831. The cubic root of 1538604140 is about 1154.4513401434.

The spelling of 1538604140 in words is "one billion, five hundred thirty-eight million, six hundred four thousand, one hundred forty".