84247389 has 6 divisors (see below), whose sum is σ = 121690686. Its totient is φ = 56164920.

The previous prime is 84247381. The next prime is 84247391. The reversal of 84247389 is 98374248.

It can be written as a sum of positive squares in only one way, i.e., 64931364 + 19316025 = 8058^2 + 4395^2 .

It is not a de Polignac number, because 84247389 - 2³ = 84247381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84247381) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4680402 + ... + 4680419.

It is an arithmetic number, because the mean of its divisors is an integer number (20281781).

Almost surely, 2^84247389 is an apocalyptic number.

It is an amenable number.

84247389 is a deficient number, since it is larger than the sum of its proper divisors (37443297).

84247389 is a wasteful number, since it uses less digits than its factorization.

84247389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9360827 (or 9360824 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 84247389 is about 9178.6376440080. The cubic root of 84247389 is about 438.3814310431.

The spelling of 84247389 in words is "eighty-four million, two hundred forty-seven thousand, three hundred eighty-nine".