251402 has 8 divisors (see below), whose sum is σ = 379236. Its totient is φ = 124992.

The previous prime is 251393. The next prime is 251417. The reversal of 251402 is 204152.

251402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 249001 + 2401 = 499^2 + 49^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 251402.

It is an unprimeable number.

251402 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, 488 + ... + 860.

2²⁵¹⁴⁰² is an apocalyptic number.

251402 is a deficient number, since it is larger than the sum of its proper divisors (127834).

251402 is a wasteful number, since it uses less digits than its factorization.

251402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 251402 is about 501.4000398883. The cubic root of 251402 is about 63.1135936650.

Adding to 251402 its reverse (204152), we get a palindrome (455554).

The spelling of 251402 in words is "two hundred fifty-one thousand, four hundred two".