401506840 has 32 divisors (see below), whose sum is σ = 1032446880. Its totient is φ = 137659392.

The previous prime is 401506757. The next prime is 401506913. The reversal of 401506840 is 48605104.

It is a super-2 number, since 2×401506840² = 322415485133571200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 401506799 and 401506808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 716697 + ... + 717256.

It is an arithmetic number, because the mean of its divisors is an integer number (32263965).

Almost surely, 2^401506840 is an apocalyptic number.

401506840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401506840 is an abundant number, since it is smaller than the sum of its proper divisors (630940040).

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

401506840 is a wasteful number, since it uses less digits than its factorization.

401506840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433971 (or 1433967 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 401506840 is about 20037.6355890609. The cubic root of 401506840 is about 737.7303480407.

The spelling of 401506840 in words is "four hundred one million, five hundred six thousand, eight hundred forty".