1358931987 has 24 divisors (see below), whose sum is σ = 2246017280. Its totient is φ = 775597680.

The previous prime is 1358931979. The next prime is 1358932013. The reversal of 1358931987 is 7891398531.

It is not a de Polignac number, because 1358931987 - 2³ = 1358931979 is a prime.

It is a super-2 number, since 2×1358931987² = 3693392290583536338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1358931947) 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, 41562 + ... + 66672.

Almost surely, 2^1358931987 is an apocalyptic number.

1358931987 is a deficient number, since it is larger than the sum of its proper divisors (887085293).

1358931987 is a wasteful number, since it uses less digits than its factorization.

1358931987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25983 (or 25980 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1358931987 is about 36863.6947008842. The cubic root of 1358931987 is about 1107.6415544666.

The spelling of 1358931987 in words is "one billion, three hundred fifty-eight million, nine hundred thirty-one thousand, nine hundred eighty-seven".