1261984196 has 24 divisors (see below), whose sum is σ = 2411048640. Its totient is φ = 573199200.

The previous prime is 1261984187. The next prime is 1261984201. The reversal of 1261984196 is 6914891621.

It is a super-2 number, since 2×1261984196² = 3185208221907532832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1261984196.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52841 + ... + 72911.

It is an arithmetic number, because the mean of its divisors is an integer number (100460360).

Almost surely, 2^1261984196 is an apocalyptic number.

It is an amenable number.

1261984196 is a deficient number, since it is larger than the sum of its proper divisors (1149064444).

1261984196 is a wasteful number, since it uses less digits than its factorization.

1261984196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21515 (or 21513 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 1261984196 is about 35524.4168988036. The cubic root of 1261984196 is about 1080.6489572517.

The spelling of 1261984196 in words is "one billion, two hundred sixty-one million, nine hundred eighty-four thousand, one hundred ninety-six".