1861212964 has 24 divisors (see below), whose sum is σ = 3555728120. Its totient is φ = 847252224.

The previous prime is 1861212959. The next prime is 1861212973. The reversal of 1861212964 is 4692121681.

It can be written as a sum of positive squares in 4 ways, for example, as 245172964 + 1616040000 = 15658^2 + 40200^2 .

It is a super-2 number, since 2×1861212964² = 6928227394723330592, which contains 22 as substring.

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, 241359 + ... + 248950.

Almost surely, 2^1861212964 is an apocalyptic number.

It is an amenable number.

1861212964 is a deficient number, since it is larger than the sum of its proper divisors (1694515156).

1861212964 is a wasteful number, since it uses less digits than its factorization.

1861212964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490399 (or 490397 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 1861212964 is about 43141.7774784489. Note that the first 3 decimals coincide. The cubic root of 1861212964 is about 1230.0762206275.

The spelling of 1861212964 in words is "one billion, eight hundred sixty-one million, two hundred twelve thousand, nine hundred sixty-four".