19857403528 has 8 divisors (see below), whose sum is σ = 37232631630. Its totient is φ = 9928701760.

The previous prime is 19857403513. The next prime is 19857403541. The reversal of 19857403528 is 82530475891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19388334564 + 469068964 = 139242^2 + 21658^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1241087713 + ... + 1241087728.

Almost surely, 2^19857403528 is an apocalyptic number.

It is an amenable number.

19857403528 is a deficient number, since it is larger than the sum of its proper divisors (17375228102).

19857403528 is a wasteful number, since it uses less digits than its factorization.

19857403528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482175447 (or 2482175443 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 19857403528 in words is "nineteen billion, eight hundred fifty-seven million, four hundred three thousand, five hundred twenty-eight".