819866402 has 16 divisors (see below), whose sum is σ = 1258122240. Its totient is φ = 400522368.

The previous prime is 819866401. The next prime is 819866477. The reversal of 819866402 is 204668918.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (819866401) 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, 49874 + ... + 64242.

It is an arithmetic number, because the mean of its divisors is an integer number (78632640).

Almost surely, 2^819866402 is an apocalyptic number.

819866402 is a deficient number, since it is larger than the sum of its proper divisors (438255838).

819866402 is a wasteful number, since it uses less digits than its factorization.

819866402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15025.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 819866402 is about 28633.3093092643. The cubic root of 819866402 is about 935.9393276778.

It can be divided in two parts, 81986 and 6402, that added together give a palindrome (88388).

The spelling of 819866402 in words is "eight hundred nineteen million, eight hundred sixty-six thousand, four hundred two".