1538858985 has 16 divisors (see below), whose sum is σ = 2472747264. Its totient is φ = 817200512.

The previous prime is 1538858957. The next prime is 1538859013. The reversal of 1538858985 is 5898588351.

It is an interprime number because it is at equal distance from previous prime (1538858957) and next prime (1538859013).

It is a cyclic number.

It is not a de Polignac number, because 1538858985 - 2⁷ = 1538858857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216657 + ... + 223646.

It is an arithmetic number, because the mean of its divisors is an integer number (154546704).

Almost surely, 2^1538858985 is an apocalyptic number.

1538858985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1538858985 is a deficient number, since it is larger than the sum of its proper divisors (933888279).

1538858985 is a wasteful number, since it uses less digits than its factorization.

1538858985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440544.

The product of its digits is 13824000, while the sum is 60.

The square root of 1538858985 is about 39228.2931695989. The cubic root of 1538858985 is about 1154.5150753828.

The spelling of 1538858985 in words is "one billion, five hundred thirty-eight million, eight hundred fifty-eight thousand, nine hundred eighty-five".