6400629 has 6 divisors (see below), whose sum is σ = 9245366. Its totient is φ = 4267080.

The previous prime is 6400627. The next prime is 6400637. The reversal of 6400629 is 9260046.

It can be written as a sum of positive squares in only one way, i.e., 6260004 + 140625 = 2502^2 + 375^2 .

It is not a de Polignac number, because 6400629 - 2¹ = 6400627 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355582 + ... + 355599.

Almost surely, 2^6400629 is an apocalyptic number.

It is an amenable number.

6400629 is a deficient number, since it is larger than the sum of its proper divisors (2844737).

6400629 is a wasteful number, since it uses less digits than its factorization.

6400629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711187 (or 711184 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 6400629 is about 2529.9464421209. The cubic root of 6400629 is about 185.6696355606.

The spelling of 6400629 in words is "six million, four hundred thousand, six hundred twenty-nine".