3640459821 has 8 divisors (see below), whose sum is σ = 4856712960. Its totient is φ = 2425589952.

The previous prime is 3640459819. The next prime is 3640459841. The reversal of 3640459821 is 1289540463.

3640459821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3640459821 - 2¹ = 3640459819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640459841) 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, 339660 + ... + 350213.

It is an arithmetic number, because the mean of its divisors is an integer number (607089120).

Almost surely, 2^3640459821 is an apocalyptic number.

It is an amenable number.

3640459821 is a deficient number, since it is larger than the sum of its proper divisors (1216253139).

3640459821 is a wasteful number, since it uses less digits than its factorization.

3640459821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691635.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 3640459821 is about 60336.2231250847. The cubic root of 3640459821 is about 1538.3391073557.

The spelling of 3640459821 in words is "three billion, six hundred forty million, four hundred fifty-nine thousand, eight hundred twenty-one".