401447640 has 64 divisors (see below), whose sum is σ = 1313832960. Its totient is φ = 97320320.

The previous prime is 401447617. The next prime is 401447653. The reversal of 401447640 is 46744104.

It is a super-2 number, since 2×401447640² = 322320415323139200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 401447598 and 401447607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150744 + ... + 153383.

It is an arithmetic number, because the mean of its divisors is an integer number (20528640).

Almost surely, 2^401447640 is an apocalyptic number.

401447640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401447640 is an abundant number, since it is smaller than the sum of its proper divisors (912385320).

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

401447640 is a wasteful number, since it uses less digits than its factorization.

401447640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304152 (or 304148 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 401447640 is about 20036.1583144075. The cubic root of 401447640 is about 737.6940881493.

The spelling of 401447640 in words is "four hundred one million, four hundred forty-seven thousand, six hundred forty".