109902406 has 4 divisors (see below), whose sum is σ = 164853612. Its totient is φ = 54951202.

The previous prime is 109902343. The next prime is 109902407. The reversal of 109902406 is 604209901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604209901 = 1163 ⋅519527.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109902407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27475600 + ... + 27475603.

It is an arithmetic number, because the mean of its divisors is an integer number (41213403).

Almost surely, 2^109902406 is an apocalyptic number.

109902406 is a deficient number, since it is larger than the sum of its proper divisors (54951206).

109902406 is an equidigital number, since it uses as much as digits as its factorization.

109902406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54951205.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 109902406 is about 10483.4348378764. The cubic root of 109902406 is about 479.0002426185. Note that the first 3 decimals are identical.

The spelling of 109902406 in words is "one hundred nine million, nine hundred two thousand, four hundred six".