142138969 has 4 divisors (see below), whose sum is σ = 162444544. Its totient is φ = 121833396.

The previous prime is 142138961. The next prime is 142138993. The reversal of 142138969 is 969831241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142138969 - 2³ = 142138961 is a prime.

It is a super-2 number, since 2×142138969² = 40406973016765922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142138961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10152777 + ... + 10152790.

It is an arithmetic number, because the mean of its divisors is an integer number (40611136).

Almost surely, 2^142138969 is an apocalyptic number.

It is an amenable number.

142138969 is a deficient number, since it is larger than the sum of its proper divisors (20305575).

142138969 is an equidigital number, since it uses as much as digits as its factorization.

142138969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20305574.

The product of its digits is 93312, while the sum is 43.

The square root of 142138969 is about 11922.2048715831. The cubic root of 142138969 is about 521.8804806051.

The spelling of 142138969 in words is "one hundred forty-two million, one hundred thirty-eight thousand, nine hundred sixty-nine".