19081939 has 4 divisors (see below), whose sum is σ = 20204424. Its totient is φ = 17959456.

The previous prime is 19081891. The next prime is 19081943. The reversal of 19081939 is 93918091.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19081939 - 2⁹ = 19081427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19081969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561217 + ... + 561250.

It is an arithmetic number, because the mean of its divisors is an integer number (5051106).

Almost surely, 2^19081939 is an apocalyptic number.

19081939 is a deficient number, since it is larger than the sum of its proper divisors (1122485).

19081939 is a wasteful number, since it uses less digits than its factorization.

19081939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122484.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 19081939 is about 4368.2878797076. The cubic root of 19081939 is about 267.2232045283.

The spelling of 19081939 in words is "nineteen million, eighty-one thousand, nine hundred thirty-nine".