1225391730 has 16 divisors (see below), whose sum is σ = 2940940224. Its totient is φ = 326771120.

The previous prime is 1225391711. The next prime is 1225391737. The reversal of 1225391730 is 371935221.

1225391730 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1225391691 and 1225391700.

It is not an unprimeable number, because it can be changed into a prime (1225391737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20423166 + ... + 20423225.

It is an arithmetic number, because the mean of its divisors is an integer number (183808764).

Almost surely, 2^1225391730 is an apocalyptic number.

1225391730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225391730 is an abundant number, since it is smaller than the sum of its proper divisors (1715548494).

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

1225391730 is a wasteful number, since it uses less digits than its factorization.

1225391730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40846401.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 1225391730 is about 35005.5956955456. The cubic root of 1225391730 is about 1070.1015217965.

The spelling of 1225391730 in words is "one billion, two hundred twenty-five million, three hundred ninety-one thousand, seven hundred thirty".