84072440 has 16 divisors (see below), whose sum is σ = 189163080. Its totient is φ = 33628960.

The previous prime is 84072431. The next prime is 84072487. The reversal of 84072440 is 4427048.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050866 + ... + 1050945.

Almost surely, 2^84072440 is an apocalyptic number.

It is an amenable number.

84072440 is an abundant number, since it is smaller than the sum of its proper divisors (105090640).

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

84072440 is a wasteful number, since it uses less digits than its factorization.

84072440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101822 (or 2101818 counting only the distinct ones).

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

The square root of 84072440 is about 9169.1024642546. The cubic root of 84072440 is about 438.0777716129.

Adding to 84072440 its reverse (4427048), we get a palindrome (88499488).

The spelling of 84072440 in words is "eighty-four million, seventy-two thousand, four hundred forty".