723829921 has 2 divisors, whose sum is σ = 723829922. Its totient is φ = 723829920.

The previous prime is 723829907. The next prime is 723829973. The reversal of 723829921 is 129928327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 691111521 + 32718400 = 26289^2 + 5720^2 .

It is a cyclic number.

It is not a de Polignac number, because 723829921 - 2¹¹ = 723827873 is a prime.

It is not a weakly prime, because it can be changed into another prime (723829901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361914960 + 361914961.

It is an arithmetic number, because the mean of its divisors is an integer number (361914961).

Almost surely, 2^723829921 is an apocalyptic number.

It is an amenable number.

723829921 is a deficient number, since it is larger than the sum of its proper divisors (1).

723829921 is an equidigital number, since it uses as much as digits as its factorization.

723829921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 723829921 is about 26904.0874403872. The cubic root of 723829921 is about 897.8673458943.

The spelling of 723829921 in words is "seven hundred twenty-three million, eight hundred twenty-nine thousand, nine hundred twenty-one".