19585939402 has 4 divisors (see below), whose sum is σ = 29378909106. Its totient is φ = 9792969700.

The previous prime is 19585939393. The next prime is 19585939453. The reversal of 19585939402 is 20493958591.

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., 17953052121 + 1632887281 = 133989^2 + 40409^2 .

It is a super-2 number, since 2×19585939402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4896484849 + ... + 4896484852.

Almost surely, 2^19585939402 is an apocalyptic number.

19585939402 is a deficient number, since it is larger than the sum of its proper divisors (9792969704).

19585939402 is an equidigital number, since it uses as much as digits as its factorization.

19585939402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9792969703.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The spelling of 19585939402 in words is "nineteen billion, five hundred eighty-five million, nine hundred thirty-nine thousand, four hundred two".