3721456639 has 8 divisors (see below), whose sum is σ = 3922421760. Its totient is φ = 3525334176.

The previous prime is 3721456619. The next prime is 3721456657. The reversal of 3721456639 is 9366541273.

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 3721456639 - 2⁹ = 3721456127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721456619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1209087 + ... + 1212160.

It is an arithmetic number, because the mean of its divisors is an integer number (490302720).

Almost surely, 2^3721456639 is an apocalyptic number.

3721456639 is a deficient number, since it is larger than the sum of its proper divisors (200965121).

3721456639 is a wasteful number, since it uses less digits than its factorization.

3721456639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421329.

The product of its digits is 816480, while the sum is 46.

The square root of 3721456639 is about 61003.7428277970. The cubic root of 3721456639 is about 1549.6643933819.

The spelling of 3721456639 in words is "three billion, seven hundred twenty-one million, four hundred fifty-six thousand, six hundred thirty-nine".