84240731 has 4 divisors (see below), whose sum is σ = 85668600. Its totient is φ = 82812864.

The previous prime is 84240721. The next prime is 84240769. The reversal of 84240731 is 13704248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84240731 - 2²⁶ = 17131867 is a prime.

It is a super-2 number, since 2×84240731² = 14193001518828722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84240694 and 84240703.

It is not an unprimeable number, because it can be changed into a prime (84240721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713846 + ... + 713963.

It is an arithmetic number, because the mean of its divisors is an integer number (21417150).

Almost surely, 2^84240731 is an apocalyptic number.

84240731 is a deficient number, since it is larger than the sum of its proper divisors (1427869).

84240731 is a wasteful number, since it uses less digits than its factorization.

84240731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427868.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 84240731 is about 9178.2749468514. The cubic root of 84240731 is about 438.3698824342.

Adding to 84240731 its reverse (13704248), we get a palindrome (97944979).

The spelling of 84240731 in words is "eighty-four million, two hundred forty thousand, seven hundred thirty-one".