1820490789 has 16 divisors (see below), whose sum is σ = 2614836224. Its totient is φ = 1119960000.

The previous prime is 1820490769. The next prime is 1820490797. The reversal of 1820490789 is 9870940281.

It is not a de Polignac number, because 1820490789 - 2⁸ = 1820490533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820490769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194364 + ... + 203514.

It is an arithmetic number, because the mean of its divisors is an integer number (163427264).

Almost surely, 2^1820490789 is an apocalyptic number.

It is an amenable number.

1820490789 is a deficient number, since it is larger than the sum of its proper divisors (794345435).

1820490789 is a wasteful number, since it uses less digits than its factorization.

1820490789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14268.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 1820490789 is about 42667.2097634706. The cubic root of 1820490789 is about 1221.0388868790.

The spelling of 1820490789 in words is "one billion, eight hundred twenty million, four hundred ninety thousand, seven hundred eighty-nine".