16401442 has 4 divisors (see below), whose sum is σ = 24602166. Its totient is φ = 8200720.

The previous prime is 16401419. The next prime is 16401457. The reversal of 16401442 is 24410461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24410461 = 541 ⋅45121.

It can be written as a sum of positive squares in only one way, i.e., 12397441 + 4004001 = 3521^2 + 2001^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100359 + ... + 4100362.

Almost surely, 2^16401442 is an apocalyptic number.

16401442 is a deficient number, since it is larger than the sum of its proper divisors (8200724).

16401442 is an equidigital number, since it uses as much as digits as its factorization.

16401442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8200723.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 16401442 is about 4049.8693806097. The cubic root of 16401442 is about 254.0742647662.

The spelling of 16401442 in words is "sixteen million, four hundred one thousand, four hundred forty-two".