635407421 has 16 divisors (see below), whose sum is σ = 700963200. Its totient is φ = 575940640.

The previous prime is 635407397. The next prime is 635407441. The reversal of 635407421 is 124704536.

It is not a de Polignac number, because 635407421 - 2¹⁴ = 635391037 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 (635407441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 756920 + ... + 757758.

It is an arithmetic number, because the mean of its divisors is an integer number (43810200).

Almost surely, 2^635407421 is an apocalyptic number.

It is an amenable number.

635407421 is a deficient number, since it is larger than the sum of its proper divisors (65555779).

635407421 is an equidigital number, since it uses as much as digits as its factorization.

635407421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441 (or 1419 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 635407421 is about 25207.2890450362. The cubic root of 635407421 is about 859.7075898799.

The spelling of 635407421 in words is "six hundred thirty-five million, four hundred seven thousand, four hundred twenty-one".