7281390 has 16 divisors (see below), whose sum is σ = 17475408. Its totient is φ = 1941696.

The previous prime is 7281353. The next prime is 7281401. The reversal of 7281390 is 931827.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 242713 = 7281390 / (7 + 2 + 8 + 1 + 3 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121327 + ... + 121386.

It is an arithmetic number, because the mean of its divisors is an integer number (1092213).

Almost surely, 2^7281390 is an apocalyptic number.

7281390 is an abundant number, since it is smaller than the sum of its proper divisors (10194018).

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

7281390 is a wasteful number, since it uses less digits than its factorization.

7281390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242723.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 7281390 is about 2698.4050844897. The cubic root of 7281390 is about 193.8227558876.

The spelling of 7281390 in words is "seven million, two hundred eighty-one thousand, three hundred ninety".