19021939 has 2 divisors, whose sum is σ = 19021940. Its totient is φ = 19021938.

The previous prime is 19021931. The next prime is 19021967. The reversal of 19021939 is 93912091.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19021939 - 2³ = 19021931 is a prime.

It is not a weakly prime, because it can be changed into another prime (19021931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9510969 + 9510970.

It is an arithmetic number, because the mean of its divisors is an integer number (9510970).

Almost surely, 2^19021939 is an apocalyptic number.

19021939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19021939 is an equidigital number, since it uses as much as digits as its factorization.

19021939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 19021939 is about 4361.4147933899. The cubic root of 19021939 is about 266.9428307418.

The spelling of 19021939 in words is "nineteen million, twenty-one thousand, nine hundred thirty-nine".