858138549 has 12 divisors (see below), whose sum is σ = 1169002944. Its totient is φ = 559693224.

The previous prime is 858138517. The next prime is 858138551. The reversal of 858138549 is 945831858.

It is not a de Polignac number, because 858138549 - 2⁵ = 858138517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858138509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346614 + ... + 349080.

It is an arithmetic number, because the mean of its divisors is an integer number (97416912).

Almost surely, 2^858138549 is an apocalyptic number.

It is an amenable number.

858138549 is a deficient number, since it is larger than the sum of its proper divisors (310864395).

858138549 is an frugal number, since it uses more digits than its factorization.

858138549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4984 (or 2517 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 51.

The square root of 858138549 is about 29294.0019287225. The cubic root of 858138549 is about 950.2819288822.

The spelling of 858138549 in words is "eight hundred fifty-eight million, one hundred thirty-eight thousand, five hundred forty-nine".