402439 has 8 divisors (see below), whose sum is σ = 432000. Its totient is φ = 373752.

The previous prime is 402419. The next prime is 402443. The reversal of 402439 is 934204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402439 - 2¹¹ = 400391 is a prime.

It is a super-4 number, since 4×402439⁴ (a number of 24 digits) contains 4444 as substring.

It is an Ulam number.

It is a Duffinian number.

402439 is a modest number, since divided by 2439 gives 4 as remainder.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942 + ... + 1300.

It is an arithmetic number, because the mean of its divisors is an integer number (54000).

2⁴⁰²⁴³⁹ is an apocalyptic number.

402439 is a deficient number, since it is larger than the sum of its proper divisors (29561).

402439 is a wasteful number, since it uses less digits than its factorization.

402439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 402439 is about 634.3808004661. The cubic root of 402439 is about 73.8300825013.

It can be divided in two parts, 402 and 439, that added together give a square (841 = 29²).

The spelling of 402439 in words is "four hundred two thousand, four hundred thirty-nine".