1225660440 has 32 divisors (see below), whose sum is σ = 3676981680. Its totient is φ = 326842752.

The previous prime is 1225660399. The next prime is 1225660451. The reversal of 1225660440 is 440665221.

It is a super-4 number, since 4×1225660440⁴ (a number of 37 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1225660398 and 1225660407.

It is a congruent number.

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, 5106799 + ... + 5107038.

Almost surely, 2^1225660440 is an apocalyptic number.

1225660440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225660440 is an abundant number, since it is smaller than the sum of its proper divisors (2451321240).

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

1225660440 is a wasteful number, since it uses less digits than its factorization.

1225660440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10213851 (or 10213847 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1225660440 is about 35009.4335858208. The cubic root of 1225660440 is about 1070.1797351431.

The spelling of 1225660440 in words is "one billion, two hundred twenty-five million, six hundred sixty thousand, four hundred forty".