1538023905 has 24 divisors (see below), whose sum is σ = 2908264320. Its totient is φ = 745708320.

The previous prime is 1538023897. The next prime is 1538023937. The reversal of 1538023905 is 5093208351.

It is not a de Polignac number, because 1538023905 - 2³ = 1538023897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1538023905.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1553065 + ... + 1554054.

It is an arithmetic number, because the mean of its divisors is an integer number (121177680).

Almost surely, 2^1538023905 is an apocalyptic number.

1538023905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1538023905 is a deficient number, since it is larger than the sum of its proper divisors (1370240415).

1538023905 is a wasteful number, since it uses less digits than its factorization.

1538023905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107141 (or 3107138 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1538023905 is about 39217.6478769444. The cubic root of 1538023905 is about 1154.3062005158.

The spelling of 1538023905 in words is "one billion, five hundred thirty-eight million, twenty-three thousand, nine hundred five".