142783991 has 12 divisors (see below), whose sum is σ = 166300920. Its totient is φ = 122235120.

The previous prime is 142783973. The next prime is 142784011. The reversal of 142783991 is 199387241.

It is a de Polignac number, because none of the positive numbers 2^k-142783991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142783691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59036 + ... + 61406.

It is an arithmetic number, because the mean of its divisors is an integer number (13858410).

Almost surely, 2^142783991 is an apocalyptic number.

142783991 is a deficient number, since it is larger than the sum of its proper divisors (23516929).

142783991 is a wasteful number, since it uses less digits than its factorization.

142783991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614 (or 3607 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 142783991 is about 11949.2255397578. The cubic root of 142783991 is about 522.6687150040.

The spelling of 142783991 in words is "one hundred forty-two million, seven hundred eighty-three thousand, nine hundred ninety-one".