1200660858 has 24 divisors (see below), whose sum is σ = 2714538528. Its totient is φ = 382819272.

The previous prime is 1200660847. The next prime is 1200660899. The reversal of 1200660858 is 8580660021.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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, 1449660 + ... + 1450487.

It is an arithmetic number, because the mean of its divisors is an integer number (113105772).

Almost surely, 2^1200660858 is an apocalyptic number.

1200660858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1200660858 is an abundant number, since it is smaller than the sum of its proper divisors (1513877670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1200660858 is a wasteful number, since it uses less digits than its factorization.

1200660858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900178 (or 2900175 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1200660858 is about 34650.5535020727. The cubic root of 1200660858 is about 1062.8536073881.

The spelling of 1200660858 in words is "one billion, two hundred million, six hundred sixty thousand, eight hundred fifty-eight".