11813810 has 16 divisors (see below), whose sum is σ = 22516056. Its totient is φ = 4447488.

The previous prime is 11813807. The next prime is 11813819. The reversal of 11813810 is 1831811.

11813810 = 330² + 331² + ... + 414².

It can be written as a sum of positive squares in 4 ways, for example, as 11812969 + 841 = 3437^2 + 29^2 .

It is a super-2 number, since 2×11813810² = 279132213432200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11813819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34577 + ... + 34916.

Almost surely, 2^11813810 is an apocalyptic number.

11813810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11813810 is a deficient number, since it is larger than the sum of its proper divisors (10702246).

11813810 is a wasteful number, since it uses less digits than its factorization.

11813810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69517.

The product of its (nonzero) digits is 192, while the sum is 23.

The square root of 11813810 is about 3437.1223428909. The cubic root of 11813810 is about 227.7525914822.

The spelling of 11813810 in words is "eleven million, eight hundred thirteen thousand, eight hundred ten".