19400999 has 2 divisors, whose sum is σ = 19401000. Its totient is φ = 19400998.

The previous prime is 19400959. The next prime is 19401007. The reversal of 19400999 is 99900491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19400999 - 2⁸ = 19400743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19400929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9700499 + 9700500.

It is an arithmetic number, because the mean of its divisors is an integer number (9700500).

Almost surely, 2^19400999 is an apocalyptic number.

19400999 is a deficient number, since it is larger than the sum of its proper divisors (1).

19400999 is an equidigital number, since it uses as much as digits as its factorization.

19400999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 19400999 is about 4404.6565132823. The cubic root of 19400999 is about 268.7043503499.

The spelling of 19400999 in words is "nineteen million, four hundred thousand, nine hundred ninety-nine".