1198577985 has 32 divisors (see below), whose sum is σ = 2101265280. Its totient is φ = 578572800.

The previous prime is 1198577981. The next prime is 1198577993. The reversal of 1198577985 is 5897758911.

It is a happy number.

It is not a de Polignac number, because 1198577985 - 2² = 1198577981 is a prime.

It is a super-2 number, since 2×1198577985² = 2873178372253320450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1198577981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21925 + ... + 53645.

It is an arithmetic number, because the mean of its divisors is an integer number (65664540).

Almost surely, 2^1198577985 is an apocalyptic number.

1198577985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1198577985 is a deficient number, since it is larger than the sum of its proper divisors (902687295).

1198577985 is a wasteful number, since it uses less digits than its factorization.

1198577985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31969.

The product of its digits is 6350400, while the sum is 60.

The square root of 1198577985 is about 34620.4850485951. The cubic root of 1198577985 is about 1062.2386487060.

The spelling of 1198577985 in words is "one billion, one hundred ninety-eight million, five hundred seventy-seven thousand, nine hundred eighty-five".