1240217856 has 216 divisors, whose sum is σ = 3861443040. Its totient is φ = 381542400.

The previous prime is 1240217843. The next prime is 1240217873. The reversal of 1240217856 is 6587120421.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1240217856.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1794471 + ... + 1795161.

Almost surely, 2^1240217856 is an apocalyptic number.

1240217856 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 1240217856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1930721520).

1240217856 is an abundant number, since it is smaller than the sum of its proper divisors (2621225184).

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

1240217856 is a wasteful number, since it uses less digits than its factorization.

1240217856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 756 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1240217856 is about 35216.7269347962. The cubic root of 1240217856 is about 1074.3999841802.

The spelling of 1240217856 in words is "one billion, two hundred forty million, two hundred seventeen thousand, eight hundred fifty-six".