1225057920 has 64 divisors (see below), whose sum is σ = 3904878240. Its totient is φ = 326681600.

The previous prime is 1225057891. The next prime is 1225057931. The reversal of 1225057920 is 297505221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 317106 + ... + 320945.

Almost surely, 2^1225057920 is an apocalyptic number.

1225057920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225057920 is an abundant number, since it is smaller than the sum of its proper divisors (2679820320).

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

1225057920 is an equidigital number, since it uses as much as digits as its factorization.

1225057920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638073 (or 638061 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 1225057920 is about 35000.8274187911. The cubic root of 1225057920 is about 1070.0043438843.

The spelling of 1225057920 in words is "one billion, two hundred twenty-five million, fifty-seven thousand, nine hundred twenty".