723990 has 16 divisors (see below), whose sum is σ = 1737648. Its totient is φ = 193056.

The previous prime is 723977. The next prime is 723997. The reversal of 723990 is 99327.

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: 24133 = 723990 / (7 + 2 + 3 + 9 + 9 + 0).

It is a d-powerful number, because it can be written as 7⁴ + 2¹⁷ + 9⁵ + 3³ + 9⁶ + 0 .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723997) by changing a digit.

723990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12037 + ... + 12096.

It is an arithmetic number, because the mean of its divisors is an integer number (108603).

2⁷²³⁹⁹⁰ is an apocalyptic number.

723990 is an abundant number, since it is smaller than the sum of its proper divisors (1013658).

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

723990 is a wasteful number, since it uses less digits than its factorization.

723990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24143.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 723990 is about 850.8760191708. The cubic root of 723990 is about 89.7933530463.

The spelling of 723990 in words is "seven hundred twenty-three thousand, nine hundred ninety".