1861258 has 8 divisors (see below), whose sum is σ = 3190752. Its totient is φ = 797676.

The previous prime is 1861253. The next prime is 1861261. The reversal of 1861258 is 8521681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1861253) 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, 66460 + ... + 66487.

It is an arithmetic number, because the mean of its divisors is an integer number (398844).

2^1861258 is an apocalyptic number.

1861258 is a deficient number, since it is larger than the sum of its proper divisors (1329494).

1861258 is a wasteful number, since it uses less digits than its factorization.

1861258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132956.

The product of its digits is 3840, while the sum is 31.

The square root of 1861258 is about 1364.2792969183. The cubic root of 1861258 is about 123.0086141983.

It can be divided in two parts, 186 and 1258, that added together give a square (1444 = 38²).

The spelling of 1861258 in words is "one million, eight hundred sixty-one thousand, two hundred fifty-eight".