1187172857 has 8 divisors (see below), whose sum is σ = 1279311936. Its totient is φ = 1095150672.

The previous prime is 1187172851. The next prime is 1187172863. The reversal of 1187172857 is 7582717811.

It is an interprime number because it is at equal distance from previous prime (1187172851) and next prime (1187172863).

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 1187172857 - 2¹² = 1187168761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187172851) 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, 7523 + ... + 49304.

It is an arithmetic number, because the mean of its divisors is an integer number (159913992).

Almost surely, 2^1187172857 is an apocalyptic number.

It is an amenable number.

1187172857 is a deficient number, since it is larger than the sum of its proper divisors (92139079).

1187172857 is a wasteful number, since it uses less digits than its factorization.

1187172857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58447.

The product of its digits is 219520, while the sum is 47.

The square root of 1187172857 is about 34455.3748637277. The cubic root of 1187172857 is about 1058.8586436213.

The spelling of 1187172857 in words is "one billion, one hundred eighty-seven million, one hundred seventy-two thousand, eight hundred fifty-seven".