629657421 has 4 divisors (see below), whose sum is σ = 839543232. Its totient is φ = 419771612.

The previous prime is 629657387. The next prime is 629657429. The reversal of 629657421 is 124756926.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 629657421 - 2¹⁷ = 629526349 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (629657429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104942901 + ... + 104942906.

It is an arithmetic number, because the mean of its divisors is an integer number (209885808).

Almost surely, 2^629657421 is an apocalyptic number.

It is an amenable number.

629657421 is a deficient number, since it is larger than the sum of its proper divisors (209885811).

629657421 is a wasteful number, since it uses less digits than its factorization.

629657421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209885810.

The product of its digits is 181440, while the sum is 42.

The square root of 629657421 is about 25092.9755310127. The cubic root of 629657421 is about 857.1064738564.

The spelling of 629657421 in words is "six hundred twenty-nine million, six hundred fifty-seven thousand, four hundred twenty-one".