1538765412 has 24 divisors (see below), whose sum is σ = 3746559936. Its totient is φ = 490620768.

The previous prime is 1538765399. The next prime is 1538765413. The reversal of 1538765412 is 2145678351.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1538765413) 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, 2787343 + ... + 2787894.

It is an arithmetic number, because the mean of its divisors is an integer number (156106664).

Almost surely, 2^1538765412 is an apocalyptic number.

1538765412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1538765412 is an abundant number, since it is smaller than the sum of its proper divisors (2207794524).

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

1538765412 is a wasteful number, since it uses less digits than its factorization.

1538765412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5575267 (or 5575265 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 1538765412 is about 39227.1004791330. The cubic root of 1538765412 is about 1154.4916741421.

The spelling of 1538765412 in words is "one billion, five hundred thirty-eight million, seven hundred sixty-five thousand, four hundred twelve".