142809946 has 4 divisors (see below), whose sum is σ = 214214922. Its totient is φ = 71404972.

The previous prime is 142809941. The next prime is 142809971. The reversal of 142809946 is 649908241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 134908225 + 7901721 = 11615^2 + 2811^2 .

It is not an unprimeable number, because it can be changed into a prime (142809941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35702485 + ... + 35702488.

Almost surely, 2^142809946 is an apocalyptic number.

142809946 is a deficient number, since it is larger than the sum of its proper divisors (71404976).

142809946 is an equidigital number, since it uses as much as digits as its factorization.

142809946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71404975.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 142809946 is about 11950.3115440561. The cubic root of 142809946 is about 522.7003829907.

The spelling of 142809946 in words is "one hundred forty-two million, eight hundred nine thousand, nine hundred forty-six".