18940349 has 6 divisors (see below), whose sum is σ = 19572030. Its totient is φ = 18328440.

The previous prime is 18940343. The next prime is 18940367. The reversal of 18940349 is 94304981.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 2699449 = 4030^2 + 1643^2 .

It is not a de Polignac number, because 18940349 - 2⁴ = 18940333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18940343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8894 + ... + 10815.

It is an arithmetic number, because the mean of its divisors is an integer number (3262005).

Almost surely, 2^18940349 is an apocalyptic number.

It is an amenable number.

18940349 is a deficient number, since it is larger than the sum of its proper divisors (631681).

18940349 is an equidigital number, since it uses as much as digits as its factorization.

18940349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19771 (or 19740 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18940349 is about 4352.0511256188. The cubic root of 18940349 is about 266.5606215500.

The spelling of 18940349 in words is "eighteen million, nine hundred forty thousand, three hundred forty-nine".