738721 has 2 divisors, whose sum is σ = 738722. Its totient is φ = 738720.

The previous prime is 738713. The next prime is 738743. The reversal of 738721 is 127837.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 130321 = 780^2 + 361^2 .

It is an emirp because it is prime and its reverse (127837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 738721 - 2³ = 738713 is a prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 738721 parts by 1215 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 738721.

It is not a weakly prime, because it can be changed into another prime (738781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 369360 + 369361.

It is an arithmetic number, because the mean of its divisors is an integer number (369361).

2⁷³⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

738721 is a deficient number, since it is larger than the sum of its proper divisors (1).

738721 is an equidigital number, since it uses as much as digits as its factorization.

738721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2352, while the sum is 28.

The square root of 738721 is about 859.4888015559. The cubic root of 738721 is about 90.3982760655.

The spelling of 738721 in words is "seven hundred thirty-eight thousand, seven hundred twenty-one".