84012390 has 192 divisors, whose sum is σ = 283046400. Its totient is φ = 17418240.

The previous prime is 84012389. The next prime is 84012407. The reversal of 84012390 is 9321048.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 186886 + ... + 187334.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^84012390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84012390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141523200).

84012390 is an abundant number, since it is smaller than the sum of its proper divisors (199034010).

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

84012390 is a wasteful number, since it uses less digits than its factorization.

84012390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 84012390 is about 9165.8272949036. The cubic root of 84012390 is about 437.9734455660.

The spelling of 84012390 in words is "eighty-four million, twelve thousand, three hundred ninety".