635399421 has 8 divisors (see below), whose sum is σ = 848722464. Its totient is φ = 422838000.

The previous prime is 635399407. The next prime is 635399431. The reversal of 635399421 is 124993536.

It is a happy number.

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

It is not a de Polignac number, because 635399421 - 2⁵ = 635399389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635399431) 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, 188455 + ... + 191796.

It is an arithmetic number, because the mean of its divisors is an integer number (106090308).

Almost surely, 2^635399421 is an apocalyptic number.

It is an amenable number.

635399421 is a deficient number, since it is larger than the sum of its proper divisors (213323043).

635399421 is a wasteful number, since it uses less digits than its factorization.

635399421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380811.

The product of its digits is 174960, while the sum is 42.

The square root of 635399421 is about 25207.1303602770. The cubic root of 635399421 is about 859.7039818591.

The spelling of 635399421 in words is "six hundred thirty-five million, three hundred ninety-nine thousand, four hundred twenty-one".