405247856 has 120 divisors (see below), whose sum is σ = 921607680. Its totient is φ = 171376128.

The previous prime is 405247847. The next prime is 405247859. The reversal of 405247856 is 658742504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405247859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3190865 + ... + 3190991.

It is an arithmetic number, because the mean of its divisors is an integer number (7680064).

Almost surely, 2^405247856 is an apocalyptic number.

405247856 is a gapful number since it is divisible by the number (46) 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 405247856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460803840).

405247856 is an abundant number, since it is smaller than the sum of its proper divisors (516359824).

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

405247856 is a wasteful number, since it uses less digits than its factorization.

405247856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 41.

The square root of 405247856 is about 20130.7688874519. The cubic root of 405247856 is about 740.0145212636.

The spelling of 405247856 in words is "four hundred five million, two hundred forty-seven thousand, eight hundred fifty-six".