402542 has 8 divisors (see below), whose sum is σ = 690096. Its totient is φ = 172512.

The previous prime is 402541. The next prime is 402551. The reversal of 402542 is 245204.

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

It is a self number, because there is not a number n which added to its sum of digits gives 402542.

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 402542.

It is not an unprimeable number, because it can be changed into a prime (402541) 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, 14363 + ... + 14390.

It is an arithmetic number, because the mean of its divisors is an integer number (86262).

2⁴⁰²⁵⁴² is an apocalyptic number.

402542 is a deficient number, since it is larger than the sum of its proper divisors (287554).

402542 is a wasteful number, since it uses less digits than its factorization.

402542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28762.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 402542 is about 634.4619767961. The cubic root of 402542 is about 73.8363806399.

Adding to 402542 its reverse (245204), we get a palindrome (647746).

It can be divided in two parts, 40254 and 2, that multiplied together give a palindrome (80508).

The spelling of 402542 in words is "four hundred two thousand, five hundred forty-two".