6403740621 has 8 divisors (see below), whose sum is σ = 8538692160. Its totient is φ = 4268974752.

The previous prime is 6403740619. The next prime is 6403740641. The reversal of 6403740621 is 1260473046.

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 6403740621 - 2¹ = 6403740619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403740641) 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, 100441 + ... + 151313.

It is an arithmetic number, because the mean of its divisors is an integer number (1067336520).

Almost surely, 2^6403740621 is an apocalyptic number.

It is an amenable number.

6403740621 is a deficient number, since it is larger than the sum of its proper divisors (2134951539).

6403740621 is a wasteful number, since it uses less digits than its factorization.

6403740621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92835.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 6403740621 is about 80023.3754661724. The cubic root of 6403740621 is about 1856.9971801773.

The spelling of 6403740621 in words is "six billion, four hundred three million, seven hundred forty thousand, six hundred twenty-one".