1225156400 has 60 divisors (see below), whose sum is σ = 3169870032. Its totient is φ = 452363520.

The previous prime is 1225156399. The next prime is 1225156421. The reversal of 1225156400 is 46515221.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 1225156400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112604 + ... + 123003.

Almost surely, 2^1225156400 is an apocalyptic number.

1225156400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225156400 is an abundant number, since it is smaller than the sum of its proper divisors (1944713632).

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

1225156400 is a wasteful number, since it uses less digits than its factorization.

1225156400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235638 (or 235627 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1225156400 is about 35002.2342144041. The cubic root of 1225156400 is about 1070.0330149652.

The spelling of 1225156400 in words is "one billion, two hundred twenty-five million, one hundred fifty-six thousand, four hundred".