1813438 has 16 divisors (see below), whose sum is σ = 3064320. Its totient is φ = 797400.

The previous prime is 1813429. The next prime is 1813447. The reversal of 1813438 is 8343181.

It is an interprime number because it is at equal distance from previous prime (1813429) and next prime (1813447).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648 + ... + 2011.

It is an arithmetic number, because the mean of its divisors is an integer number (191520).

2^1813438 is an apocalyptic number.

1813438 is a deficient number, since it is larger than the sum of its proper divisors (1250882).

1813438 is a wasteful number, since it uses less digits than its factorization.

1813438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703.

The product of its digits is 2304, while the sum is 28.

The square root of 1813438 is about 1346.6395211786. The cubic root of 1813438 is about 121.9460031583.

It can be divided in two parts, 18 and 13438, that added together give a square (13456 = 116²).

The spelling of 1813438 in words is "one million, eight hundred thirteen thousand, four hundred thirty-eight".