19402 has 8 divisors (see below), whose sum is σ = 29700. Its totient is φ = 9504.

The previous prime is 19391. The next prime is 19403. The reversal of 19402 is 20491.

It can be written as a sum of positive squares in 2 ways, for example, as 19321 + 81 = 139^2 + 9^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19403) 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, 124 + ... + 232.

2¹⁹⁴⁰² is an apocalyptic number.

19402 is a deficient number, since it is larger than the sum of its proper divisors (10298).

19402 is a wasteful number, since it uses less digits than its factorization.

19402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 19402 is about 139.2910621684. The cubic root of 19402 is about 26.8708971563.

Adding to 19402 its reverse (20491), we get a palindrome (39893).

Subtracting 19402 from its reverse (20491), we obtain a square (1089 = 33²).

The spelling of 19402 in words is "nineteen thousand, four hundred two".