401439 has 4 divisors (see below), whose sum is σ = 535256. Its totient is φ = 267624.

The previous prime is 401417. The next prime is 401473. The reversal of 401439 is 934104.

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

It is not a de Polignac number, because 401439 - 2⁵ = 401407 is a prime.

It is a super-2 number, since 2×401439² = 322306541442, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 401439.

It is not an unprimeable number, because it can be changed into a prime (401039) 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, 66904 + ... + 66909.

It is an arithmetic number, because the mean of its divisors is an integer number (133814).

2⁴⁰¹⁴³⁹ is an apocalyptic number.

401439 is a deficient number, since it is larger than the sum of its proper divisors (133817).

401439 is a wasteful number, since it uses less digits than its factorization.

401439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133816.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 401439 is about 633.5921401028. The cubic root of 401439 is about 73.7688795867.

The spelling of 401439 in words is "four hundred one thousand, four hundred thirty-nine".