19402161 has 4 divisors (see below), whose sum is σ = 25869552. Its totient is φ = 12934772.

The previous prime is 19402157. The next prime is 19402177. The reversal of 19402161 is 16120491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19402161 - 2² = 19402157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19402121) 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, 3233691 + ... + 3233696.

It is an arithmetic number, because the mean of its divisors is an integer number (6467388).

Almost surely, 2^19402161 is an apocalyptic number.

It is an amenable number.

19402161 is a deficient number, since it is larger than the sum of its proper divisors (6467391).

19402161 is an equidigital number, since it uses as much as digits as its factorization.

19402161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6467390.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 19402161 is about 4404.7884171660. The cubic root of 19402161 is about 268.7097148197.

The spelling of 19402161 in words is "nineteen million, four hundred two thousand, one hundred sixty-one".