622405729 has 6 divisors (see below), whose sum is σ = 684132050. Its totient is φ = 565823280.

The previous prime is 622405723. The next prime is 622405757. The reversal of 622405729 is 927504226.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 622402704 + 3025 = 24948^2 + 55^2 .

It is not a de Polignac number, because 622405729 - 2¹³ = 622397537 is a prime.

It is a super-3 number, since 3×622405729³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (622405723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2571804 + ... + 2572045.

Almost surely, 2^622405729 is an apocalyptic number.

It is an amenable number.

622405729 is a deficient number, since it is larger than the sum of its proper divisors (61726321).

622405729 is a wasteful number, since it uses less digits than its factorization.

622405729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143871 (or 5143860 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 622405729 is about 24948.0606260286. The cubic root of 622405729 is about 853.8033618458.

It can be divided in two parts, 622 and 405729, that added together give a triangular number (406351 = T₉₀₁).

The spelling of 622405729 in words is "six hundred twenty-two million, four hundred five thousand, seven hundred twenty-nine".