1225391800 has 48 divisors (see below), whose sum is σ = 2902816440. Its totient is φ = 480904320.

The previous prime is 1225391749. The next prime is 1225391803. The reversal of 1225391800 is 81935221.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225391803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47202 + ... + 68401.

Almost surely, 2^1225391800 is an apocalyptic number.

1225391800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225391800 is an abundant number, since it is smaller than the sum of its proper divisors (1677424640).

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

1225391800 is a wasteful number, since it uses less digits than its factorization.

1225391800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115672 (or 115663 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1225391800 is about 35005.5966953857. The cubic root of 1225391800 is about 1070.1015421729.

The spelling of 1225391800 in words is "one billion, two hundred twenty-five million, three hundred ninety-one thousand, eight hundred".