1220405512 has 16 divisors (see below), whose sum is σ = 2289696300. Its totient is φ = 609819840.

The previous prime is 1220405497. The next prime is 1220405531. The reversal of 1220405512 is 2155040221.

It can be written as a sum of positive squares in 2 ways, for example, as 1177450596 + 42954916 = 34314^2 + 6554^2 .

It is a super-2 number, since 2×1220405512² = 2978779227439964288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34087 + ... + 60022.

Almost surely, 2^1220405512 is an apocalyptic number.

It is an amenable number.

1220405512 is a deficient number, since it is larger than the sum of its proper divisors (1069290788).

1220405512 is a wasteful number, since it uses less digits than its factorization.

1220405512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95736 (or 95732 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 1220405512 is about 34934.3027982526. The cubic root of 1220405512 is about 1068.6481054573.

Adding to 1220405512 its reverse (2155040221), we get a palindrome (3375445733).

The spelling of 1220405512 in words is "one billion, two hundred twenty million, four hundred five thousand, five hundred twelve".