722131405 has 8 divisors (see below), whose sum is σ = 889978392. Its totient is φ = 562091328.

The previous prime is 722131393. The next prime is 722131409. The reversal of 722131405 is 504131227.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 342583081 + 379548324 = 18509^2 + 19482^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 722131405 - 2⁵ = 722131373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722131405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722131409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1951522 + ... + 1951891.

It is an arithmetic number, because the mean of its divisors is an integer number (111247299).

Almost surely, 2^722131405 is an apocalyptic number.

It is an amenable number.

722131405 is a deficient number, since it is larger than the sum of its proper divisors (167846987).

722131405 is a wasteful number, since it uses less digits than its factorization.

722131405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903455.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 722131405 is about 26872.5027676992. The cubic root of 722131405 is about 897.1644936369.

The spelling of 722131405 in words is "seven hundred twenty-two million, one hundred thirty-one thousand, four hundred five".