18440353 has 4 divisors (see below), whose sum is σ = 18553648. Its totient is φ = 18327060.

The previous prime is 18440351. The next prime is 18440363. The reversal of 18440353 is 35304481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35304481 = 277 ⋅127453.

It is a cyclic number.

It is not a de Polignac number, because 18440353 - 2¹ = 18440351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18440351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56403 + ... + 56728.

It is an arithmetic number, because the mean of its divisors is an integer number (4638412).

Almost surely, 2^18440353 is an apocalyptic number.

It is an amenable number.

18440353 is a deficient number, since it is larger than the sum of its proper divisors (113295).

18440353 is a wasteful number, since it uses less digits than its factorization.

18440353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113294.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 18440353 is about 4294.2232126428. The cubic root of 18440353 is about 264.1940769500.

The spelling of 18440353 in words is "eighteen million, four hundred forty thousand, three hundred fifty-three".