3626721 has 32 divisors (see below), whose sum is σ = 6348800. Its totient is φ = 2002320.

The previous prime is 3626717. The next prime is 3626723. The reversal of 3626721 is 1276263.

It is a happy number.

It is not a de Polignac number, because 3626721 - 2² = 3626717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (3626723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5550 + ... + 6168.

It is an arithmetic number, because the mean of its divisors is an integer number (198400).

Almost surely, 2^3626721 is an apocalyptic number.

3626721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3626721 is a deficient number, since it is larger than the sum of its proper divisors (2722079).

3626721 is a wasteful number, since it uses less digits than its factorization.

3626721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 660 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 3626721 is about 1904.3951795780. The cubic root of 3626721 is about 153.6401475865.

The spelling of 3626721 in words is "three million, six hundred twenty-six thousand, seven hundred twenty-one".