1919005857 has 16 divisors (see below), whose sum is σ = 2891160000. Its totient is φ = 1257652512.

The previous prime is 1919005801. The next prime is 1919005859. The reversal of 1919005857 is 7585009191.

It is not a de Polignac number, because 1919005857 - 2⁶ = 1919005793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1919005859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 600732 + ... + 603917.

It is an arithmetic number, because the mean of its divisors is an integer number (180697500).

Almost surely, 2^1919005857 is an apocalyptic number.

It is an amenable number.

1919005857 is a deficient number, since it is larger than the sum of its proper divisors (972154143).

1919005857 is a wasteful number, since it uses less digits than its factorization.

1919005857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204717 (or 1204711 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 45.

The square root of 1919005857 is about 43806.4590785423. The cubic root of 1919005857 is about 1242.6784491352.

The spelling of 1919005857 in words is "one billion, nine hundred nineteen million, five thousand, eight hundred fifty-seven".