1187986925 has 12 divisors (see below), whose sum is σ = 1473801876. Its totient is φ = 949939200.

The previous prime is 1187986907. The next prime is 1187986973. The reversal of 1187986925 is 5296897811.

It can be written as a sum of positive squares in 6 ways, for example, as 65334889 + 1122652036 = 8083^2 + 33506^2 .

It is not a de Polignac number, because 1187986925 - 2¹⁰ = 1187985901 is a prime.

It is a super-2 number, since 2×1187986925² = 2822625867941911250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48845 + ... + 69005.

It is an arithmetic number, because the mean of its divisors is an integer number (122816823).

Almost surely, 2^1187986925 is an apocalyptic number.

It is an amenable number.

1187986925 is a deficient number, since it is larger than the sum of its proper divisors (285814951).

1187986925 is a wasteful number, since it uses less digits than its factorization.

1187986925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22528 (or 22523 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 56.

The square root of 1187986925 is about 34467.1862065937. The cubic root of 1187986925 is about 1059.1006151202.

The spelling of 1187986925 in words is "one billion, one hundred eighty-seven million, nine hundred eighty-six thousand, nine hundred twenty-five".