19397879390 has 16 divisors (see below), whose sum is σ = 35150522400. Its totient is φ = 7707076320.

The previous prime is 19397879381. The next prime is 19397879447. The reversal of 19397879390 is 9397879391.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6507866 + ... + 6510845.

It is an arithmetic number, because the mean of its divisors is an integer number (2196907650).

Almost surely, 2^19397879390 is an apocalyptic number.

19397879390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19397879390 is a deficient number, since it is larger than the sum of its proper divisors (15752643010).

19397879390 is a wasteful number, since it uses less digits than its factorization.

19397879390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13018867.

The product of its (nonzero) digits is 23147208, while the sum is 65.

Subtracting from 19397879390 its reverse (9397879391), we obtain a palindrome (9999999999).

The spelling of 19397879390 in words is "nineteen billion, three hundred ninety-seven million, eight hundred seventy-nine thousand, three hundred ninety".