19439593402 has 4 divisors (see below), whose sum is σ = 29159390106. Its totient is φ = 9719796700.

The previous prime is 19439593391. The next prime is 19439593421. The reversal of 19439593402 is 20439593491.

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

It can be written as a sum of positive squares in only one way, i.e., 19018892281 + 420701121 = 137909^2 + 20511^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4859898349 + ... + 4859898352.

Almost surely, 2^19439593402 is an apocalyptic number.

19439593402 is a deficient number, since it is larger than the sum of its proper divisors (9719796704).

19439593402 is an equidigital number, since it uses as much as digits as its factorization.

19439593402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9719796703.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The spelling of 19439593402 in words is "nineteen billion, four hundred thirty-nine million, five hundred ninety-three thousand, four hundred two".