1912861 has 4 divisors (see below), whose sum is σ = 1924092. Its totient is φ = 1901632.

The previous prime is 1912847. The next prime is 1912873. The reversal of 1912861 is 1682191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1092025 + 820836 = 1045^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 1912861 - 2⁵ = 1912829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912831) 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, 5356 + ... + 5701.

It is an arithmetic number, because the mean of its divisors is an integer number (481023).

2^1912861 is an apocalyptic number.

It is an amenable number.

1912861 is a deficient number, since it is larger than the sum of its proper divisors (11231).

1912861 is a wasteful number, since it uses less digits than its factorization.

1912861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11230.

The product of its digits is 864, while the sum is 28.

The square root of 1912861 is about 1383.0621822608. The cubic root of 1912861 is about 124.1350635504.

It can be divided in two parts, 19 and 12861, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 1912861 in words is "one million, nine hundred twelve thousand, eight hundred sixty-one".