8438390 has 16 divisors (see below), whose sum is σ = 15225408. Its totient is φ = 3367296.

The previous prime is 8438387. The next prime is 8438399. The reversal of 8438390 is 938348.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8438390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8438399) 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, 5219 + ... + 6641.

It is an arithmetic number, because the mean of its divisors is an integer number (951588).

Almost surely, 2^8438390 is an apocalyptic number.

8438390 is the 2372-nd pentagonal number.

8438390 is a deficient number, since it is larger than the sum of its proper divisors (6787018).

8438390 is a wasteful number, since it uses less digits than its factorization.

8438390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 8438390 is about 2904.8907036238. The cubic root of 8438390 is about 203.5884790127.

The spelling of 8438390 in words is "eight million, four hundred thirty-eight thousand, three hundred ninety".