723431642 has 8 divisors (see below), whose sum is σ = 1091645856. Its totient is φ = 359549692.

The previous prime is 723431641. The next prime is 723431647. The reversal of 723431642 is 246134327.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 723431599 and 723431608.

It is not an unprimeable number, because it can be changed into a prime (723431641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082648 + ... + 1083315.

It is an arithmetic number, because the mean of its divisors is an integer number (136455732).

Almost surely, 2^723431642 is an apocalyptic number.

723431642 is a deficient number, since it is larger than the sum of its proper divisors (368214214).

723431642 is a wasteful number, since it uses less digits than its factorization.

723431642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166132.

The product of its digits is 24192, while the sum is 32.

The square root of 723431642 is about 26896.6845912280. The cubic root of 723431642 is about 897.7026353239.

Adding to 723431642 its reverse (246134327), we get a palindrome (969565969).

The spelling of 723431642 in words is "seven hundred twenty-three million, four hundred thirty-one thousand, six hundred forty-two".