634429021 has 8 divisors (see below), whose sum is σ = 638442360. Its totient is φ = 630423552.

The previous prime is 634429007. The next prime is 634429031. The reversal of 634429021 is 120924436.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15912121 + 618516900 = 3989^2 + 24870^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 634429021 - 2¹⁵ = 634396253 is a prime.

It is a super-3 number, since 3×634429021³ (a number of 27 digits) contains 333 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 (634429031) 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, 270771 + ... + 273103.

It is an arithmetic number, because the mean of its divisors is an integer number (79805295).

Almost surely, 2^634429021 is an apocalyptic number.

It is an amenable number.

634429021 is a deficient number, since it is larger than the sum of its proper divisors (4013339).

634429021 is a wasteful number, since it uses less digits than its factorization.

634429021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 634429021 is about 25187.8744835685. The cubic root of 634429021 is about 859.2661041099.

The spelling of 634429021 in words is "six hundred thirty-four million, four hundred twenty-nine thousand, twenty-one".