819115140 has 48 divisors (see below), whose sum is σ = 2303159040. Its totient is φ = 217516768.

The previous prime is 819115117. The next prime is 819115177. The reversal of 819115140 is 41511918.

It is a happy number.

It is a super-2 number, since 2×819115140² = 1341899225154439200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 819115098 and 819115107.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 1195 × 717 × 956.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3427141 + ... + 3427379.

It is an arithmetic number, because the mean of its divisors is an integer number (47982480).

Almost surely, 2^819115140 is an apocalyptic number.

It is an amenable number.

819115140 is an abundant number, since it is smaller than the sum of its proper divisors (1484043900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

819115140 is an frugal number, since it uses more digits than its factorization.

819115140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 30.

The square root of 819115140 is about 28620.1876304122. The cubic root of 819115140 is about 935.6533662394.

The spelling of 819115140 in words is "eight hundred nineteen million, one hundred fifteen thousand, one hundred forty".