401440231 has 4 divisors (see below), whose sum is σ = 401614200. Its totient is φ = 401266264.

The previous prime is 401440163. The next prime is 401440279. The reversal of 401440231 is 132044104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401440231 - 2⁷ = 401440103 is a prime.

It is a super-2 number, since 2×401440231² = 322308518130666722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401440199 and 401440208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401440031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83476 + ... + 88153.

It is an arithmetic number, because the mean of its divisors is an integer number (100403550).

Almost surely, 2^401440231 is an apocalyptic number.

401440231 is a deficient number, since it is larger than the sum of its proper divisors (173969).

401440231 is a wasteful number, since it uses less digits than its factorization.

401440231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173968.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 401440231 is about 20035.9734228213. The cubic root of 401440231 is about 737.6895498994.

Adding to 401440231 its reverse (132044104), we get a palindrome (533484335).

The spelling of 401440231 in words is "four hundred one million, four hundred forty thousand, two hundred thirty-one".