19408920338 has 4 divisors (see below), whose sum is σ = 29113380510. Its totient is φ = 9704460168.

The previous prime is 19408920329. The next prime is 19408920359. The reversal of 19408920338 is 83302980491.

It is a happy number.

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., 12034748209 + 7374172129 = 109703^2 + 85873^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19408920292 and 19408920301.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4852230083 + ... + 4852230086.

Almost surely, 2^19408920338 is an apocalyptic number.

19408920338 is a deficient number, since it is larger than the sum of its proper divisors (9704460172).

19408920338 is an equidigital number, since it uses as much as digits as its factorization.

19408920338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9704460171.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 19408920338 in words is "nineteen billion, four hundred eight million, nine hundred twenty thousand, three hundred thirty-eight".