401218992 has 120 divisors (see below), whose sum is σ = 1179016800. Its totient is φ = 127366272.

The previous prime is 401218967. The next prime is 401218999. The reversal of 401218992 is 299812104.

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 (401218999) 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, 1751934 + ... + 1752162.

It is an arithmetic number, because the mean of its divisors is an integer number (9825140).

Almost surely, 2^401218992 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 401218992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (589508400).

401218992 is an abundant number, since it is smaller than the sum of its proper divisors (777797808).

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

401218992 is a wasteful number, since it uses less digits than its factorization.

401218992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 257 counting only the distinct ones).

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

The square root of 401218992 is about 20030.4516174748. The cubic root of 401218992 is about 737.5540081869.

The spelling of 401218992 in words is "four hundred one million, two hundred eighteen thousand, nine hundred ninety-two".