109685810 has 16 divisors (see below), whose sum is σ = 212621976. Its totient is φ = 40499328.

The previous prime is 109685789. The next prime is 109685813. The reversal of 109685810 is 18586901.

It can be written as a sum of positive squares in 4 ways, for example, as 36566209 + 73119601 = 6047^2 + 8551^2 .

It is a super-2 number, since 2×109685810² = 24061953830712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (109685813) 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, 421739 + ... + 421998.

Almost surely, 2^109685810 is an apocalyptic number.

109685810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

109685810 is a deficient number, since it is larger than the sum of its proper divisors (102936166).

109685810 is a wasteful number, since it uses less digits than its factorization.

109685810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843757.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 109685810 is about 10473.0993502401. The cubic root of 109685810 is about 478.6853639558.

The spelling of 109685810 in words is "one hundred nine million, six hundred eighty-five thousand, eight hundred ten".