1861167 has 24 divisors (see below), whose sum is σ = 3151872. Its totient is φ = 966000.

The previous prime is 1861157. The next prime is 1861187. The reversal of 1861167 is 7611681.

It is a happy number.

It is not a de Polignac number, because 1861167 - 2⁴ = 1861151 is a prime.

It is a super-3 number, since 3×1861167³ = 19340926981589833389, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1042 + ... + 2192.

It is an arithmetic number, because the mean of its divisors is an integer number (131328).

2^1861167 is an apocalyptic number.

1861167 is a deficient number, since it is larger than the sum of its proper divisors (1290705).

1861167 is a wasteful number, since it uses less digits than its factorization.

1861167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1172 counting only the distinct ones).

The product of its digits is 2016, while the sum is 30.

The square root of 1861167 is about 1364.2459455685. The cubic root of 1861167 is about 123.0066094670.

It can be divided in two parts, 1 and 861167, that added together give a palindrome (861168).

The spelling of 1861167 in words is "one million, eight hundred sixty-one thousand, one hundred sixty-seven".