819872390 has 16 divisors (see below), whose sum is σ = 1486544832. Its totient is φ = 325554624.

The previous prime is 819872387. The next prime is 819872393. The reversal of 819872390 is 93278918.

It is an interprime number because it is at equal distance from previous prime (819872387) and next prime (819872393).

It is a super-3 number, since 3×819872390³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819872393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297854 + ... + 300593.

It is an arithmetic number, because the mean of its divisors is an integer number (92909052).

Almost surely, 2^819872390 is an apocalyptic number.

819872390 is a deficient number, since it is larger than the sum of its proper divisors (666672442).

819872390 is a wasteful number, since it uses less digits than its factorization.

819872390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598591.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 819872390 is about 28633.4138726069. The cubic root of 819872390 is about 935.9416062568.

The spelling of 819872390 in words is "eight hundred nineteen million, eight hundred seventy-two thousand, three hundred ninety".