401994180 has 144 divisors (see below), whose sum is σ = 1406845440. Its totient is φ = 91010304.

The previous prime is 401994167. The next prime is 401994181. The reversal of 401994180 is 81499104.

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

It is not an unprimeable number, because it can be changed into a prime (401994181) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135877 + ... + 138803.

It is an arithmetic number, because the mean of its divisors is an integer number (9769760).

Almost surely, 2^401994180 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 401994180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703422720).

401994180 is an abundant number, since it is smaller than the sum of its proper divisors (1004851260).

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

401994180 is a wasteful number, since it uses less digits than its factorization.

401994180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3058 (or 3053 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 401994180 is about 20049.7925176297. The cubic root of 401994180 is about 738.0287075444.

The spelling of 401994180 in words is "four hundred one million, nine hundred ninety-four thousand, one hundred eighty".