19401939 has 24 divisors (see below), whose sum is σ = 29158272. Its totient is φ = 12418560.

The previous prime is 19401937. The next prime is 19401961. The reversal of 19401939 is 93910491.

It is not a de Polignac number, because 19401939 - 2¹ = 19401937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19401937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54787 + ... + 55139.

It is an arithmetic number, because the mean of its divisors is an integer number (1214928).

Almost surely, 2^19401939 is an apocalyptic number.

19401939 is a deficient number, since it is larger than the sum of its proper divisors (9756333).

19401939 is a wasteful number, since it uses less digits than its factorization.

19401939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 19401939 is about 4404.7632172456. The cubic root of 19401939 is about 268.7086899548.

The spelling of 19401939 in words is "nineteen million, four hundred one thousand, nine hundred thirty-nine".