16042391 has 8 divisors (see below), whose sum is σ = 16291968. Its totient is φ = 15795000.

The previous prime is 16042363. The next prime is 16042393. The reversal of 16042391 is 19324061.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16042391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16042391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16042393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19376 + ... + 20186.

It is an arithmetic number, because the mean of its divisors is an integer number (2036496).

Almost surely, 2^16042391 is an apocalyptic number.

16042391 is a deficient number, since it is larger than the sum of its proper divisors (249577).

16042391 is a wasteful number, since it uses less digits than its factorization.

16042391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 16042391 is about 4005.2953698822. The cubic root of 16042391 is about 252.2065525386.

The spelling of 16042391 in words is "sixteen million, forty-two thousand, three hundred ninety-one".