213861858 has 16 divisors (see below), whose sum is σ = 488827200. Its totient is φ = 61103376.

The previous prime is 213861847. The next prime is 213861871. The reversal of 213861858 is 858168312.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 5091949 = 213861858 / (2 + 1 + 3 + 8 + 6 + 1 + 8 + 5 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2545933 + ... + 2546016.

It is an arithmetic number, because the mean of its divisors is an integer number (30551700).

Almost surely, 2^213861858 is an apocalyptic number.

213861858 is an abundant number, since it is smaller than the sum of its proper divisors (274965342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213861858 is a wasteful number, since it uses less digits than its factorization.

213861858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5091961.

The product of its digits is 92160, while the sum is 42.

The square root of 213861858 is about 14624.0164797500. The cubic root of 213861858 is about 598.0136703027.

It can be divided in two parts, 21 and 3861858, that multiplied together give a palindrome (81099018).

The spelling of 213861858 in words is "two hundred thirteen million, eight hundred sixty-one thousand, eight hundred fifty-eight".