1990658723 has 2 divisors, whose sum is σ = 1990658724. Its totient is φ = 1990658722.

The previous prime is 1990658713. The next prime is 1990658729. The reversal of 1990658723 is 3278560991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1990658723 - 2²² = 1986464419 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1990658729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995329361 + 995329362.

It is an arithmetic number, because the mean of its divisors is an integer number (995329362).

Almost surely, 2^1990658723 is an apocalyptic number.

1990658723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990658723 is an equidigital number, since it uses as much as digits as its factorization.

1990658723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 1990658723 is about 44616.7986637320. The cubic root of 1990658723 is about 1257.9564428021.

The spelling of 1990658723 in words is "one billion, nine hundred ninety million, six hundred fifty-eight thousand, seven hundred twenty-three".