629877389 has 2 divisors, whose sum is σ = 629877390. Its totient is φ = 629877388.

The previous prime is 629877371. The next prime is 629877397. The reversal of 629877389 is 983778926.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 627903364 + 1974025 = 25058^2 + 1405^2 .

It is a cyclic number.

It is not a de Polignac number, because 629877389 - 2²⁰ = 628828813 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (629870389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314938694 + 314938695.

It is an arithmetic number, because the mean of its divisors is an integer number (314938695).

Almost surely, 2^629877389 is an apocalyptic number.

It is an amenable number.

629877389 is a deficient number, since it is larger than the sum of its proper divisors (1).

629877389 is an equidigital number, since it uses as much as digits as its factorization.

629877389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 59.

The square root of 629877389 is about 25097.3582075883. The cubic root of 629877389 is about 857.2062710054.

The spelling of 629877389 in words is "six hundred twenty-nine million, eight hundred seventy-seven thousand, three hundred eighty-nine".