17949440 has 72 divisors (see below), whose sum is σ = 44273040. Its totient is φ = 6967296.

The previous prime is 17949427. The next prime is 17949443. The reversal of 17949440 is 4494971.

It is a junction number, because it is equal to n+sod(n) for n = 17949394 and 17949403.

It is not an unprimeable number, because it can be changed into a prime (17949443) 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, 47171 + ... + 47549.

Almost surely, 2^17949440 is an apocalyptic number.

17949440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17949440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22136520).

17949440 is an abundant number, since it is smaller than the sum of its proper divisors (26323600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17949440 is an equidigital number, since it uses as much as digits as its factorization.

17949440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 17949440 is about 4236.6779438612. The cubic root of 17949440 is about 261.8285302681.

The spelling of 17949440 in words is "seventeen million, nine hundred forty-nine thousand, four hundred forty".