1230440256 has 42 divisors (see below), whose sum is σ = 3526836482. Its totient is φ = 410146560.

The previous prime is 1230440149. The next prime is 1230440257. The reversal of 1230440256 is 6520440321.

It can be written as a sum of positive squares in only one way, i.e., 1153281600 + 77158656 = 33960^2 + 8784^2 .

It is a hoax number, since the sum of its digits (27) 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 (1230440257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1067515 + ... + 1068666.

Almost surely, 2^1230440256 is an apocalyptic number.

1230440256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1230440256 is an abundant number, since it is smaller than the sum of its proper divisors (2296396226).

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

1230440256 is a wasteful number, since it uses less digits than its factorization.

1230440256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136199 (or 2136186 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 1230440256 is about 35077.6318470902. The cubic root of 1230440256 is about 1071.5690887095.

Adding to 1230440256 its reverse (6520440321), we get a palindrome (7750880577).

The spelling of 1230440256 in words is "one billion, two hundred thirty million, four hundred forty thousand, two hundred fifty-six".