401610640 has 40 divisors (see below), whose sum is σ = 949582080. Its totient is φ = 157919616.

The previous prime is 401610637. The next prime is 401610661. The reversal of 401610640 is 46016104.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×401610640² = 322582212322419200, which contains 22 as substring.

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, 37824 + ... + 47263.

It is an arithmetic number, because the mean of its divisors is an integer number (23739552).

Almost surely, 2^401610640 is an apocalyptic number.

401610640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401610640 is an abundant number, since it is smaller than the sum of its proper divisors (547971440).

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

401610640 is a wasteful number, since it uses less digits than its factorization.

401610640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85159 (or 85153 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 401610640 is about 20040.2255476329. The cubic root of 401610640 is about 737.7939167478.

Adding to 401610640 its reverse (46016104), we get a palindrome (447626744).

The spelling of 401610640 in words is "four hundred one million, six hundred ten thousand, six hundred forty".