16402394 has 4 divisors (see below), whose sum is σ = 24603594. Its totient is φ = 8201196.

The previous prime is 16402391. The next prime is 16402403. The reversal of 16402394 is 49320461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49320461 = 4787 ⋅10303.

It can be written as a sum of positive squares in only one way, i.e., 8922169 + 7480225 = 2987^2 + 2735^2 .

It is not an unprimeable number, because it can be changed into a prime (16402391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100597 + ... + 4100600.

Almost surely, 2^16402394 is an apocalyptic number.

16402394 is a deficient number, since it is larger than the sum of its proper divisors (8201200).

16402394 is an equidigital number, since it uses as much as digits as its factorization.

16402394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8201199.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 16402394 is about 4049.9869135591. The cubic root of 16402394 is about 254.0791804726.

The spelling of 16402394 in words is "sixteen million, four hundred two thousand, three hundred ninety-four".