401398560 has 288 divisors, whose sum is σ = 1528450560. Its totient is φ = 95330304.

The previous prime is 401398531. The next prime is 401398567. The reversal of 401398560 is 65893104.

401398560 is a `hidden beast` number, since 4 + 0 + 1 + 3 + 98 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×401398560² = 322241607940147200, which contains 22 as substring.

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 (401398567) 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, 464689 + ... + 465551.

It is an arithmetic number, because the mean of its divisors is an integer number (5307120).

Almost surely, 2^401398560 is an apocalyptic number.

401398560 is a gapful number since it is divisible by the number (40) 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 401398560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764225280).

401398560 is an abundant number, since it is smaller than the sum of its proper divisors (1127052000).

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

401398560 is a wasteful number, since it uses less digits than its factorization.

401398560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 401398560 is about 20034.9334912797. The cubic root of 401398560 is about 737.6640240365.

The spelling of 401398560 in words is "four hundred one million, three hundred ninety-eight thousand, five hundred sixty".