19400071 has 2 divisors, whose sum is σ = 19400072. Its totient is φ = 19400070.

The previous prime is 19400057. The next prime is 19400081. The reversal of 19400071 is 17000491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19400071 - 2⁵ = 19400039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19400081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9700035 + 9700036.

It is an arithmetic number, because the mean of its divisors is an integer number (9700036).

Almost surely, 2^19400071 is an apocalyptic number.

19400071 is a deficient number, since it is larger than the sum of its proper divisors (1).

19400071 is an equidigital number, since it uses as much as digits as its factorization.

19400071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 19400071 is about 4404.5511689615. The cubic root of 19400071 is about 268.7000660067.

The spelling of 19400071 in words is "nineteen million, four hundred thousand, seventy-one".