401780736 has 260 divisors, whose sum is σ = 1379626512. Its totient is φ = 114130944.

The previous prime is 401780711. The next prime is 401780759. The reversal of 401780736 is 637087104.

It is a super-2 number, since 2×401780736² = 322855519641403392, which contains 22 as substring.

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 401780736.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2322346 + ... + 2322518.

Almost surely, 2^401780736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401780736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689813256).

401780736 is an abundant number, since it is smaller than the sum of its proper divisors (977845776).

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

401780736 is an equidigital number, since it uses as much as digits as its factorization.

401780736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 401780736 is about 20044.4689627837. The cubic root of 401780736 is about 737.8980624621.

The spelling of 401780736 in words is "four hundred one million, seven hundred eighty thousand, seven hundred thirty-six".