19394697235 has 4 divisors (see below), whose sum is σ = 23273636688. Its totient is φ = 15515757784.

The previous prime is 19394697211. The next prime is 19394697239. The reversal of 19394697235 is 53279649391.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53279649391 = 17 ⋅3134097023.

It is a cyclic number.

It is not a de Polignac number, because 19394697235 - 2²⁷ = 19260479507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19394697235.

It is not an unprimeable number, because it can be changed into a prime (19394697239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1939469719 + ... + 1939469728.

It is an arithmetic number, because the mean of its divisors is an integer number (5818409172).

Almost surely, 2^19394697235 is an apocalyptic number.

19394697235 is a deficient number, since it is larger than the sum of its proper divisors (3878939453).

19394697235 is an equidigital number, since it uses as much as digits as its factorization.

19394697235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878939452.

The product of its digits is 11022480, while the sum is 58.

The spelling of 19394697235 in words is "nineteen billion, three hundred ninety-four million, six hundred ninety-seven thousand, two hundred thirty-five".