1440257868 has 96 divisors (see below), whose sum is σ = 4289976320. Its totient is φ = 409328640.

The previous prime is 1440257857. The next prime is 1440257911. The reversal of 1440257868 is 8687520441.

1440257868 is a `hidden beast` number, since 14 + 4 + 0 + 2 + 578 + 68 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140973 + ... + 150843.

Almost surely, 2^1440257868 is an apocalyptic number.

1440257868 is a gapful number since it is divisible by the number (18) 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 1440257868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2144988160).

1440257868 is an abundant number, since it is smaller than the sum of its proper divisors (2849718452).

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

1440257868 is a wasteful number, since it uses less digits than its factorization.

1440257868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10084 (or 10076 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 1440257868 is about 37950.7294791549. The cubic root of 1440257868 is about 1129.3106370448.

The spelling of 1440257868 in words is "one billion, four hundred forty million, two hundred fifty-seven thousand, eight hundred sixty-eight".