1211990560 has 48 divisors (see below), whose sum is σ = 3123634752. Its totient is φ = 440723200.

The previous prime is 1211990557. The next prime is 1211990579. The reversal of 1211990560 is 650991121.

It is a happy number.

It is a super-2 number, since 2×1211990560² = 2937842235058227200, 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, 342556 + ... + 346075.

It is an arithmetic number, because the mean of its divisors is an integer number (65075724).

Almost surely, 2^1211990560 is an apocalyptic number.

1211990560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211990560 is an abundant number, since it is smaller than the sum of its proper divisors (1911644192).

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

1211990560 is a wasteful number, since it uses less digits than its factorization.

1211990560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688657 (or 688649 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 1211990560 is about 34813.6547923369. The cubic root of 1211990560 is about 1066.1862541472.

The spelling of 1211990560 in words is "one billion, two hundred eleven million, nine hundred ninety thousand, five hundred sixty".