8742440 has 32 divisors (see below), whose sum is σ = 22481280. Its totient is φ = 2997312.

The previous prime is 8742421. The next prime is 8742449. The reversal of 8742440 is 442478.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8742449) 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, 15332 + ... + 15891.

It is an arithmetic number, because the mean of its divisors is an integer number (702540).

Almost surely, 2^8742440 is an apocalyptic number.

It is an amenable number.

8742440 is an abundant number, since it is smaller than the sum of its proper divisors (13738840).

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

8742440 is a wasteful number, since it uses less digits than its factorization.

8742440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31241 (or 31237 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 8742440 is about 2956.7617421767. The cubic root of 8742440 is about 206.0049013821.

The spelling of 8742440 in words is "eight million, seven hundred forty-two thousand, four hundred forty".