722987 has 4 divisors (see below), whose sum is σ = 726000. Its totient is φ = 719976.

The previous prime is 722983. The next prime is 723029. The reversal of 722987 is 789227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 722987 - 2² = 722983 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722987.

It is not an unprimeable number, because it can be changed into a prime (722983) 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, 1112 + ... + 1637.

It is an arithmetic number, because the mean of its divisors is an integer number (181500).

2⁷²²⁹⁸⁷ is an apocalyptic number.

722987 is a deficient number, since it is larger than the sum of its proper divisors (3013).

722987 is a wasteful number, since it uses less digits than its factorization.

722987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012.

The product of its digits is 14112, while the sum is 35.

The square root of 722987 is about 850.2864223307. The cubic root of 722987 is about 89.7518679634.

The spelling of 722987 in words is "seven hundred twenty-two thousand, nine hundred eighty-seven".