1918306 has 16 divisors (see below), whose sum is σ = 3137400. Its totient is φ = 874368.

The previous prime is 1918303. The next prime is 1918307. The reversal of 1918306 is 6038191.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1092025 + 826281 = 1045^2 + 909^2 .

It is not an unprimeable number, because it can be changed into a prime (1918303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1900 + ... + 2728.

2^1918306 is an apocalyptic number.

1918306 is a deficient number, since it is larger than the sum of its proper divisors (1219094).

1918306 is a wasteful number, since it uses less digits than its factorization.

1918306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1918306 is about 1385.0292415686. The cubic root of 1918306 is about 124.2527363448.

Subtracting 1918306 from its reverse (6038191), we obtain a triangular number (4119885 = T₂₈₇₀).

The spelling of 1918306 in words is "one million, nine hundred eighteen thousand, three hundred six".