402438 has 8 divisors (see below), whose sum is σ = 804888. Its totient is φ = 134144.

The previous prime is 402419. The next prime is 402443. The reversal of 402438 is 834204.

It is a happy number.

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

402438 is an admirable number.

It is a Curzon number.

It is a plaindrome in base 13.

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 402438.

It is an unprimeable number.

402438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33531 + ... + 33542.

It is an arithmetic number, because the mean of its divisors is an integer number (100611).

2⁴⁰²⁴³⁸ is an apocalyptic number.

402438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

402438 is a wasteful number, since it uses less digits than its factorization.

402438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67078.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 402438 is about 634.3800122955. The cubic root of 402438 is about 73.8300213491.

The spelling of 402438 in words is "four hundred two thousand, four hundred thirty-eight".