723494381 has 4 divisors (see below), whose sum is σ = 766052892. Its totient is φ = 680935872.

The previous prime is 723494377. The next prime is 723494413. The reversal of 723494381 is 183494327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183494327 = 79 ⋅2322713.

It can be written as a sum of positive squares in 2 ways, for example, as 281065225 + 442429156 = 16765^2 + 21034^2 .

It is a cyclic number.

It is not a de Polignac number, because 723494381 - 2² = 723494377 is a prime.

It is a super-2 number, since 2×723494381² = 1046888238677146322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723494081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21279230 + ... + 21279263.

It is an arithmetic number, because the mean of its divisors is an integer number (191513223).

Almost surely, 2^723494381 is an apocalyptic number.

It is an amenable number.

723494381 is a deficient number, since it is larger than the sum of its proper divisors (42558511).

723494381 is a wasteful number, since it uses less digits than its factorization.

723494381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42558510.

The product of its digits is 145152, while the sum is 41.

The square root of 723494381 is about 26897.8508621042. The cubic root of 723494381 is about 897.7285854088.

The spelling of 723494381 in words is "seven hundred twenty-three million, four hundred ninety-four thousand, three hundred eighty-one".