17872042 has 4 divisors (see below), whose sum is σ = 26808066. Its totient is φ = 8936020.

The previous prime is 17872039. The next prime is 17872067. The reversal of 17872042 is 24027871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24027871 = 7 ⋅3432553.

It can be written as a sum of positive squares in only one way, i.e., 13995081 + 3876961 = 3741^2 + 1969^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 17871995 and 17872013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4468009 + ... + 4468012.

Almost surely, 2^17872042 is an apocalyptic number.

17872042 is a deficient number, since it is larger than the sum of its proper divisors (8936024).

17872042 is an equidigital number, since it uses as much as digits as its factorization.

17872042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8936023.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 17872042 is about 4227.5337964350. The cubic root of 17872042 is about 261.4516531040.

The spelling of 17872042 in words is "seventeen million, eight hundred seventy-two thousand, forty-two".