1226407720 has 16 divisors (see below), whose sum is σ = 2759417460. Its totient is φ = 490563072.

The previous prime is 1226407681. The next prime is 1226407729. The reversal of 1226407720 is 277046221.

It can be written as a sum of positive squares in 2 ways, for example, as 1192044676 + 34363044 = 34526^2 + 5862^2 .

It is not an unprimeable number, because it can be changed into a prime (1226407729) 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, 15330057 + ... + 15330136.

Almost surely, 2^1226407720 is an apocalyptic number.

1226407720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226407720 is an abundant number, since it is smaller than the sum of its proper divisors (1533009740).

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

1226407720 is a wasteful number, since it uses less digits than its factorization.

1226407720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30660204 (or 30660200 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 1226407720 is about 35020.1045115516. The cubic root of 1226407720 is about 1070.3971856463.

The spelling of 1226407720 in words is "one billion, two hundred twenty-six million, four hundred seven thousand, seven hundred twenty".