142619809 has 4 divisors (see below), whose sum is σ = 147220480. Its totient is φ = 138019140.

The previous prime is 142619797. The next prime is 142619819. The reversal of 142619809 is 908916241.

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 142619809 - 2¹⁷ = 142488737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142619819) 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, 2300289 + ... + 2300350.

It is an arithmetic number, because the mean of its divisors is an integer number (36805120).

Almost surely, 2^142619809 is an apocalyptic number.

It is an amenable number.

142619809 is a deficient number, since it is larger than the sum of its proper divisors (4600671).

142619809 is an equidigital number, since it uses as much as digits as its factorization.

142619809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600670.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 142619809 is about 11942.3535787549. The cubic root of 142619809 is about 522.4683057322.

The spelling of 142619809 in words is "one hundred forty-two million, six hundred nineteen thousand, eight hundred nine".