170138942 has 4 divisors (see below), whose sum is σ = 255208416. Its totient is φ = 85069470.

The previous prime is 170138923. The next prime is 170138951. The reversal of 170138942 is 249831071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 249831071 = 7 ⋅35690153.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42534734 + ... + 42534737.

It is an arithmetic number, because the mean of its divisors is an integer number (63802104).

Almost surely, 2^170138942 is an apocalyptic number.

170138942 is a deficient number, since it is larger than the sum of its proper divisors (85069474).

170138942 is an equidigital number, since it uses as much as digits as its factorization.

170138942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85069473.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 170138942 is about 13043.7319046353. The cubic root of 170138942 is about 554.1167044209.

The spelling of 170138942 in words is "one hundred seventy million, one hundred thirty-eight thousand, nine hundred forty-two".