1538645856 has 48 divisors (see below), whose sum is σ = 4406125248. Its totient is φ = 466256000.

The previous prime is 1538645839. The next prime is 1538645863. The reversal of 1538645856 is 6585468351.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 1538645799 and 1538645808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727470 + ... + 729581.

It is an arithmetic number, because the mean of its divisors is an integer number (91794276).

Almost surely, 2^1538645856 is an apocalyptic number.

1538645856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1538645856 is an abundant number, since it is smaller than the sum of its proper divisors (2867479392).

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

1538645856 is a wasteful number, since it uses less digits than its factorization.

1538645856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457075 (or 1457067 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 51.

The square root of 1538645856 is about 39225.5765540801. The cubic root of 1538645856 is about 1154.4617735520.

The spelling of 1538645856 in words is "one billion, five hundred thirty-eight million, six hundred forty-five thousand, eight hundred fifty-six".