1861406 has 8 divisors (see below), whose sum is σ = 2798064. Its totient is φ = 928720.

The previous prime is 1861403. The next prime is 1861417. The reversal of 1861406 is 6041681.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861403) 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, 911 + ... + 2133.

It is an arithmetic number, because the mean of its divisors is an integer number (349758).

2^1861406 is an apocalyptic number.

1861406 is a deficient number, since it is larger than the sum of its proper divisors (936658).

1861406 is a wasteful number, since it uses less digits than its factorization.

1861406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1861406 is about 1364.3335369330. Note that the first 3 decimals coincide. The cubic root of 1861406 is about 123.0118745008.

The spelling of 1861406 in words is "one million, eight hundred sixty-one thousand, four hundred six".