25402 has 8 divisors (see below), whose sum is σ = 41076. Its totient is φ = 11712.

The previous prime is 25391. The next prime is 25409. The reversal of 25402 is 20452.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25281 + 121 = 159^2 + 11^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (25409) by changing a digit.

25402 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, 463 + ... + 514.

2²⁵⁴⁰² is an apocalyptic number.

25402 is a deficient number, since it is larger than the sum of its proper divisors (15674).

25402 is a wasteful number, since it uses less digits than its factorization.

25402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 25402 is about 159.3800489396. The cubic root of 25402 is about 29.3960720993.

Adding to 25402 its reverse (20452), we get a palindrome (45854).

Subtracting from 25402 its reverse (20452), we obtain a triangular number (4950 = T₉₉).

The spelling of 25402 in words is "twenty-five thousand, four hundred two".