19939107428 has 6 divisors (see below), whose sum is σ = 34893438006. Its totient is φ = 9969553712.

The previous prime is 19939107379. The next prime is 19939107449. The reversal of 19939107428 is 82470193991.

It can be written as a sum of positive squares in only one way, i.e., 18720259684 + 1218847744 = 136822^2 + 34912^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19939107428.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2492388425 + ... + 2492388432.

It is an arithmetic number, because the mean of its divisors is an integer number (5815573001).

Almost surely, 2^19939107428 is an apocalyptic number.

It is an amenable number.

19939107428 is a deficient number, since it is larger than the sum of its proper divisors (14954330578).

19939107428 is a wasteful number, since it uses less digits than its factorization.

19939107428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4984776861 (or 4984776859 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 19939107428 in words is "nineteen billion, nine hundred thirty-nine million, one hundred seven thousand, four hundred twenty-eight".