3721645399 has 8 divisors (see below), whose sum is σ = 3901079952. Its totient is φ = 3546432960.

The previous prime is 3721645309. The next prime is 3721645427. The reversal of 3721645399 is 9935461273.

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 3721645399 - 2¹¹ = 3721643351 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 (3721645309) 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, 1053724 + ... + 1057249.

It is an arithmetic number, because the mean of its divisors is an integer number (487634994).

Almost surely, 2^3721645399 is an apocalyptic number.

3721645399 is a deficient number, since it is larger than the sum of its proper divisors (179434553).

3721645399 is a wasteful number, since it uses less digits than its factorization.

3721645399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111057.

The product of its digits is 1224720, while the sum is 49.

The square root of 3721645399 is about 61005.2899263662. The cubic root of 3721645399 is about 1549.6905936697.

The spelling of 3721645399 in words is "three billion, seven hundred twenty-one million, six hundred forty-five thousand, three hundred ninety-nine".