1890668857 has 8 divisors (see below), whose sum is σ = 2357197632. Its totient is φ = 1473248400.

The previous prime is 1890668837. The next prime is 1890668863. The reversal of 1890668857 is 7588660981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1890668857 - 2⁷ = 1890668729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1890668837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12276994 + ... + 12277147.

It is an arithmetic number, because the mean of its divisors is an integer number (294649704).

Almost surely, 2^1890668857 is an apocalyptic number.

It is an amenable number.

1890668857 is a deficient number, since it is larger than the sum of its proper divisors (466528775).

1890668857 is a wasteful number, since it uses less digits than its factorization.

1890668857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24554159.

The product of its (nonzero) digits is 5806080, while the sum is 58.

The square root of 1890668857 is about 43481.8221444318. The cubic root of 1890668857 is about 1236.5314219749.

The spelling of 1890668857 in words is "one billion, eight hundred ninety million, six hundred sixty-eight thousand, eight hundred fifty-seven".