1242400256 has 80 divisors (see below), whose sum is σ = 2685203136. Its totient is φ = 572030976.

The previous prime is 1242400207. The next prime is 1242400261. The reversal of 1242400256 is 6520042421.

It is a super-2 number, since 2×1242400256² = 3087116792217731072, which contains 22 as substring.

It is a congruent number.

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, 407570 + ... + 410606.

Almost surely, 2^1242400256 is an apocalyptic number.

1242400256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1242400256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1342601568).

1242400256 is an abundant number, since it is smaller than the sum of its proper divisors (1442802880).

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

1242400256 is an equidigital number, since it uses as much as digits as its factorization.

1242400256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119 (or 3103 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1242400256 is about 35247.6985915393. The cubic root of 1242400256 is about 1075.0298188231.

Adding to 1242400256 its reverse (6520042421), we get a palindrome (7762442677).

The spelling of 1242400256 in words is "one billion, two hundred forty-two million, four hundred thousand, two hundred fifty-six".