858387172 has 6 divisors (see below), whose sum is σ = 1502177558. Its totient is φ = 429193584.

The previous prime is 858387169. The next prime is 858387197. The reversal of 858387172 is 271783858.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 602898916 + 255488256 = 24554^2 + 15984^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107298393 + ... + 107298400.

Almost surely, 2^858387172 is an apocalyptic number.

It is an amenable number.

858387172 is a deficient number, since it is larger than the sum of its proper divisors (643790386).

858387172 is a wasteful number, since it uses less digits than its factorization.

858387172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214596797 (or 214596795 counting only the distinct ones).

The product of its digits is 752640, while the sum is 49.

The square root of 858387172 is about 29298.2452034247. The cubic root of 858387172 is about 950.3736930583.

The spelling of 858387172 in words is "eight hundred fifty-eight million, three hundred eighty-seven thousand, one hundred seventy-two".