722005406 has 4 divisors (see below), whose sum is σ = 1083008112. Its totient is φ = 361002702.

The previous prime is 722005391. The next prime is 722005409. The reversal of 722005406 is 604500227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604500227 = 5281 ⋅114467.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722005409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180501350 + ... + 180501353.

It is an arithmetic number, because the mean of its divisors is an integer number (270752028).

Almost surely, 2^722005406 is an apocalyptic number.

722005406 is a deficient number, since it is larger than the sum of its proper divisors (361002706).

722005406 is a wasteful number, since it uses less digits than its factorization.

722005406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361002705.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 722005406 is about 26870.1582801442. The cubic root of 722005406 is about 897.1123108885.

The spelling of 722005406 in words is "seven hundred twenty-two million, five thousand, four hundred six".