187864057 has 4 divisors (see below), whose sum is σ = 187917696. Its totient is φ = 187810420.

The previous prime is 187864013. The next prime is 187864081. The reversal of 187864057 is 750468781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187864057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 187863998 and 187864016.

It is not an unprimeable number, because it can be changed into a prime (187864657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21169 + ... + 28702.

It is an arithmetic number, because the mean of its divisors is an integer number (46979424).

Almost surely, 2^187864057 is an apocalyptic number.

It is an amenable number.

187864057 is a deficient number, since it is larger than the sum of its proper divisors (53639).

187864057 is an equidigital number, since it uses as much as digits as its factorization.

187864057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53638.

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 187864057 is about 13706.3509731803. The cubic root of 187864057 is about 572.7273184353.

The spelling of 187864057 in words is "one hundred eighty-seven million, eight hundred sixty-four thousand, fifty-seven".