1226272640 has 32 divisors (see below), whose sum is σ = 2931559560. Its totient is φ = 490508800.

The previous prime is 1226272637. The next prime is 1226272657. The reversal of 1226272640 is 462726221.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1226272640² = 3007489175225139200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1226272597 and 1226272606.

It is a congruent number.

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, 957386 + ... + 958665.

Almost surely, 2^1226272640 is an apocalyptic number.

1226272640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226272640 is an abundant number, since it is smaller than the sum of its proper divisors (1705286920).

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

1226272640 is an equidigital number, since it uses as much as digits as its factorization.

1226272640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916070 (or 1916058 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 1226272640 is about 35018.1758519772. The cubic root of 1226272640 is about 1070.3578853499.

Adding to 1226272640 its reverse (462726221), we get a palindrome (1688998861).

The spelling of 1226272640 in words is "one billion, two hundred twenty-six million, two hundred seventy-two thousand, six hundred forty".