401642240 has 36 divisors (see below), whose sum is σ = 962061744. Its totient is φ = 160656384.

The previous prime is 401642233. The next prime is 401642251. The reversal of 401642240 is 42246104.

It is a super-2 number, since 2×401642240² = 322632977904435200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155612 + ... + 158171.

Almost surely, 2^401642240 is an apocalyptic number.

401642240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401642240 is an abundant number, since it is smaller than the sum of its proper divisors (560419504).

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

401642240 is an equidigital number, since it uses as much as digits as its factorization.

401642240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313804 (or 313790 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 401642240 is about 20041.0139464050. The cubic root of 401642240 is about 737.8132668960.

Adding to 401642240 its reverse (42246104), we get a palindrome (443888344).

The spelling of 401642240 in words is "four hundred one million, six hundred forty-two thousand, two hundred forty".