1189978828 has 6 divisors (see below), whose sum is σ = 2082462956. Its totient is φ = 594989412.

The previous prime is 1189978771. The next prime is 1189978859. The reversal of 1189978828 is 8288799811.

It is a super-2 number, since 2×1189978828² = 2832099222176507168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 148747350 + ... + 148747357.

Almost surely, 2^1189978828 is an apocalyptic number.

It is an amenable number.

1189978828 is a deficient number, since it is larger than the sum of its proper divisors (892484128).

1189978828 is a wasteful number, since it uses less digits than its factorization.

1189978828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297494711 (or 297494709 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 61.

The square root of 1189978828 is about 34496.0697471466. The cubic root of 1189978828 is about 1059.6922175114.

The spelling of 1189978828 in words is "one billion, one hundred eighty-nine million, nine hundred seventy-eight thousand, eight hundred twenty-eight".