1220409892 has 12 divisors (see below), whose sum is σ = 2300003356. Its totient is φ = 563266080.

The previous prime is 1220409809. The next prime is 1220409893. The reversal of 1220409892 is 2989040221.

It can be written as a sum of positive squares in 2 ways, for example, as 91853056 + 1128556836 = 9584^2 + 33594^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1220409893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11734659 + ... + 11734762.

Almost surely, 2^1220409892 is an apocalyptic number.

It is an amenable number.

1220409892 is a deficient number, since it is larger than the sum of its proper divisors (1079593464).

1220409892 is a wasteful number, since it uses less digits than its factorization.

1220409892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23469438 (or 23469436 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1220409892 is about 34934.3654872963. The cubic root of 1220409892 is about 1068.6493839048.

The spelling of 1220409892 in words is "one billion, two hundred twenty million, four hundred nine thousand, eight hundred ninety-two".