639433401 has 8 divisors (see below), whose sum is σ = 859086624. Its totient is φ = 423034560.

The previous prime is 639433381. The next prime is 639433423. The reversal of 639433401 is 104334936.

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

It is not a de Polignac number, because 639433401 - 2⁶ = 639433337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639433471) 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 7 ways as a sum of consecutive naturals, for example, 813136 + ... + 813921.

It is an arithmetic number, because the mean of its divisors is an integer number (107385828).

Almost surely, 2^639433401 is an apocalyptic number.

It is an amenable number.

639433401 is a deficient number, since it is larger than the sum of its proper divisors (219653223).

639433401 is a wasteful number, since it uses less digits than its factorization.

639433401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627191.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 639433401 is about 25287.0204057338. The cubic root of 639433401 is about 861.5194883145.

The spelling of 639433401 in words is "six hundred thirty-nine million, four hundred thirty-three thousand, four hundred one".