19401010939 has 4 divisors (see below), whose sum is σ = 19925362624. Its totient is φ = 18876659256.

The previous prime is 19401010921. The next prime is 19401010973. The reversal of 19401010939 is 93901010491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93901010491 = 29 ⋅3237965879.

It is a cyclic number.

It is not a de Polignac number, because 19401010939 - 2⁵ = 19401010907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 524351647 = 19401010939 / (1 + 9 + 4 + 0 + 1 + 0 + 1 + 0 + 9 + 3 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19401010898 and 19401010907.

It is not an unprimeable number, because it can be changed into a prime (19401010919) 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, 262175787 + ... + 262175860.

It is an arithmetic number, because the mean of its divisors is an integer number (4981340656).

Almost surely, 2^19401010939 is an apocalyptic number.

19401010939 is a deficient number, since it is larger than the sum of its proper divisors (524351685).

19401010939 is an equidigital number, since it uses as much as digits as its factorization.

19401010939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524351684.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 19401010939 in words is "nineteen billion, four hundred one million, ten thousand, nine hundred thirty-nine".