1188139972 has 6 divisors (see below), whose sum is σ = 2079244958. Its totient is φ = 594069984.

The previous prime is 1188139963. The next prime is 1188139973. The reversal of 1188139972 is 2799318811.

It can be written as a sum of positive squares in only one way, i.e., 936727236 + 251412736 = 30606^2 + 15856^2 .

It is not an unprimeable number, because it can be changed into a prime (1188139973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 148517493 + ... + 148517500.

Almost surely, 2^1188139972 is an apocalyptic number.

It is an amenable number.

1188139972 is a deficient number, since it is larger than the sum of its proper divisors (891104986).

1188139972 is a wasteful number, since it uses less digits than its factorization.

1188139972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297034997 (or 297034995 counting only the distinct ones).

The product of its digits is 217728, while the sum is 49.

The square root of 1188139972 is about 34469.4063192275. The cubic root of 1188139972 is about 1059.1460940752.

The spelling of 1188139972 in words is "one billion, one hundred eighty-eight million, one hundred thirty-nine thousand, nine hundred seventy-two".