105843990 has 64 divisors (see below), whose sum is σ = 291133440. Its totient is φ = 24124800.

The previous prime is 105843979. The next prime is 105844033. The reversal of 105843990 is 99348501.

It is a super-2 number, since 2×105843990² = 22405900438240200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146851 + ... + 147569.

It is an arithmetic number, because the mean of its divisors is an integer number (4548960).

Almost surely, 2^105843990 is an apocalyptic number.

105843990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

105843990 is an abundant number, since it is smaller than the sum of its proper divisors (185289450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

105843990 is a wasteful number, since it uses less digits than its factorization.

105843990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 105843990 is about 10288.0508357998. The cubic root of 105843990 is about 473.0300537977.

The spelling of 105843990 in words is "one hundred five million, eight hundred forty-three thousand, nine hundred ninety".