142194879 has 16 divisors (see below), whose sum is σ = 221747200. Its totient is φ = 89806968.

The previous prime is 142194869. The next prime is 142194883. The reversal of 142194879 is 978491241.

It is a happy number.

It is not a de Polignac number, because 142194879 - 2¹³ = 142186687 is a prime.

It is a super-2 number, since 2×142194879² = 40438767227649282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142194869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138079 + ... + 139104.

It is an arithmetic number, because the mean of its divisors is an integer number (13859200).

Almost surely, 2^142194879 is an apocalyptic number.

142194879 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

142194879 is a deficient number, since it is larger than the sum of its proper divisors (79552321).

142194879 is a wasteful number, since it uses less digits than its factorization.

142194879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277211 (or 277205 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 142194879 is about 11924.5494254500. The cubic root of 142194879 is about 521.9488984194.

The spelling of 142194879 in words is "one hundred forty-two million, one hundred ninety-four thousand, eight hundred seventy-nine".