1839690997 has 4 divisors (see below), whose sum is σ = 1843940140. Its totient is φ = 1835441856.

The previous prime is 1839690971. The next prime is 1839691027. The reversal of 1839690997 is 7990969381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 219306481 + 1620384516 = 14809^2 + 40254^2 .

It is a cyclic number.

It is not a de Polignac number, because 1839690997 - 2¹⁵ = 1839658229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1839690947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123922 + ... + 2124787.

It is an arithmetic number, because the mean of its divisors is an integer number (460985035).

Almost surely, 2^1839690997 is an apocalyptic number.

It is an amenable number.

1839690997 is a deficient number, since it is larger than the sum of its proper divisors (4249143).

1839690997 is an equidigital number, since it uses as much as digits as its factorization.

1839690997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249142.

The product of its (nonzero) digits is 6613488, while the sum is 61.

The square root of 1839690997 is about 42891.6191930312. The cubic root of 1839690997 is about 1225.3165356107.

The spelling of 1839690997 in words is "one billion, eight hundred thirty-nine million, six hundred ninety thousand, nine hundred ninety-seven".