19900739 has 2 divisors, whose sum is σ = 19900740. Its totient is φ = 19900738.

The previous prime is 19900723. The next prime is 19900747. The reversal of 19900739 is 93700991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19900739 - 2⁴ = 19900723 is a prime.

It is a super-2 number, since 2×19900739² = 792078825492242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19900789) 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 as a sum of consecutive naturals, namely, 9950369 + 9950370.

It is an arithmetic number, because the mean of its divisors is an integer number (9950370).

Almost surely, 2^19900739 is an apocalyptic number.

19900739 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900739 is an equidigital number, since it uses as much as digits as its factorization.

19900739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 19900739 is about 4461.0244339165. The cubic root of 19900739 is about 270.9919570240.

The spelling of 19900739 in words is "nineteen million, nine hundred thousand, seven hundred thirty-nine".