629386909 has 8 divisors (see below), whose sum is σ = 647120088. Its totient is φ = 611691840.

The previous prime is 629386889. The next prime is 629386939. The reversal of 629386909 is 909683926.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 440874009 + 188512900 = 20997^2 + 13730^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-629386909 is a prime.

It is a super-2 number, since 2×629386909² = 792255762441148562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629386939) 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, 25779 + ... + 43855.

It is an arithmetic number, because the mean of its divisors is an integer number (80890011).

Almost surely, 2^629386909 is an apocalyptic number.

It is an amenable number.

629386909 is a deficient number, since it is larger than the sum of its proper divisors (17733179).

629386909 is a wasteful number, since it uses less digits than its factorization.

629386909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19055.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 629386909 is about 25087.5847582026. The cubic root of 629386909 is about 856.9837135585.

The spelling of 629386909 in words is "six hundred twenty-nine million, three hundred eighty-six thousand, nine hundred nine".