1988118315 has 24 divisors (see below), whose sum is σ = 3478286448. Its totient is φ = 1050417600.

The previous prime is 1988118313. The next prime is 1988118317. The reversal of 1988118315 is 5138118891.

It is an interprime number because it is at equal distance from previous prime (1988118313) and next prime (1988118317).

It is not a de Polignac number, because 1988118315 - 2¹ = 1988118313 is a prime.

It is a super-2 number, since 2×1988118315² = 7905228868876878450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1988118311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201636 + ... + 211265.

It is an arithmetic number, because the mean of its divisors is an integer number (144928602).

Almost surely, 2^1988118315 is an apocalyptic number.

1988118315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1988118315 is a deficient number, since it is larger than the sum of its proper divisors (1490168133).

1988118315 is a wasteful number, since it uses less digits than its factorization.

1988118315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413019 (or 413016 counting only the distinct ones).

The product of its digits is 69120, while the sum is 45.

The square root of 1988118315 is about 44588.3203877428. The cubic root of 1988118315 is about 1257.4210952207.

The spelling of 1988118315 in words is "one billion, nine hundred eighty-eight million, one hundred eighteen thousand, three hundred fifteen".