401424240 has 80 divisors (see below), whose sum is σ = 1422194688. Its totient is φ = 91753728.

The previous prime is 401424223. The next prime is 401424253. The reversal of 401424240 is 42424104.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×401424240² = 322282840919155200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117792 + ... + 121151.

Almost surely, 2^401424240 is an apocalyptic number.

401424240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401424240 is an abundant number, since it is smaller than the sum of its proper divisors (1020770448).

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

401424240 is a wasteful number, since it uses less digits than its factorization.

401424240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238966 (or 238960 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 401424240 is about 20035.5743616199. The cubic root of 401424240 is about 737.6797547092.

Adding to 401424240 its reverse (42424104), we get a palindrome (443848344).

The spelling of 401424240 in words is "four hundred one million, four hundred twenty-four thousand, two hundred forty".