819039142 has 16 divisors (see below), whose sum is σ = 1246910112. Its totient is φ = 403446400.

The previous prime is 819039113. The next prime is 819039149. The reversal of 819039142 is 241930918.

It is a super-2 number, since 2×819039142² = 1341650232256192328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819039149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26892 + ... + 48592.

It is an arithmetic number, because the mean of its divisors is an integer number (77931882).

Almost surely, 2^819039142 is an apocalyptic number.

819039142 is a deficient number, since it is larger than the sum of its proper divisors (427870970).

819039142 is a wasteful number, since it uses less digits than its factorization.

819039142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21983.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 819039142 is about 28618.8599004223. The cubic root of 819039142 is about 935.6244285153.

The spelling of 819039142 in words is "eight hundred nineteen million, thirty-nine thousand, one hundred forty-two".