190857899 has 2 divisors, whose sum is σ = 190857900. Its totient is φ = 190857898.

The previous prime is 190857881. The next prime is 190857913. The reversal of 190857899 is 998758091.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (998758091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190857899 is a prime.

It is a super-2 number, since 2×190857899² = 72853475221388402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (190857839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95428949 + 95428950.

It is an arithmetic number, because the mean of its divisors is an integer number (95428950).

Almost surely, 2^190857899 is an apocalyptic number.

190857899 is a deficient number, since it is larger than the sum of its proper divisors (1).

190857899 is an equidigital number, since it uses as much as digits as its factorization.

190857899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 56.

The square root of 190857899 is about 13815.1329707680. The cubic root of 190857899 is about 575.7536672938.

The spelling of 190857899 in words is "one hundred ninety million, eight hundred fifty-seven thousand, eight hundred ninety-nine".