17994749 has 4 divisors (see below), whose sum is σ = 18377664. Its totient is φ = 17611836.

The previous prime is 17994731. The next prime is 17994791. The reversal of 17994749 is 94749971.

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: 94749971 = 157 ⋅603503.

It is a cyclic number.

It is not a de Polignac number, because 17994749 - 2¹² = 17990653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17994697 and 17994706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17994709) 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, 191387 + ... + 191480.

It is an arithmetic number, because the mean of its divisors is an integer number (4594416).

Almost surely, 2^17994749 is an apocalyptic number.

It is an amenable number.

17994749 is a deficient number, since it is larger than the sum of its proper divisors (382915).

17994749 is an equidigital number, since it uses as much as digits as its factorization.

17994749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382914.

The product of its digits is 571536, while the sum is 50.

The square root of 17994749 is about 4242.0218056960. The cubic root of 17994749 is about 262.0486526589.

The spelling of 17994749 in words is "seventeen million, nine hundred ninety-four thousand, seven hundred forty-nine".