1187391344 has 40 divisors (see below), whose sum is σ = 2326672512. Its totient is φ = 586987520.

The previous prime is 1187391329. The next prime is 1187391371. The reversal of 1187391344 is 4431937811.

It is a super-2 number, since 2×1187391344² = 2819796407612252672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1375457 + ... + 1376319.

Almost surely, 2^1187391344 is an apocalyptic number.

It is an amenable number.

1187391344 is a deficient number, since it is larger than the sum of its proper divisors (1139281168).

1187391344 is a wasteful number, since it uses less digits than its factorization.

1187391344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745 (or 1739 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 1187391344 is about 34458.5452972118. The cubic root of 1187391344 is about 1058.9235969981.

The spelling of 1187391344 in words is "one billion, one hundred eighty-seven million, three hundred ninety-one thousand, three hundred forty-four".