3607921 has 2 divisors, whose sum is σ = 3607922. Its totient is φ = 3607920.

The previous prime is 3607897. The next prime is 3607931. The reversal of 3607921 is 1297063.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 921600 = 1639^2 + 960^2 .

It is an emirp because it is prime and its reverse (1297063) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3607921 - 2¹⁵ = 3575153 is a prime.

It is an Ulam number.

3607921 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3607921.

It is not a weakly prime, because it can be changed into another prime (3607931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1803960 + 1803961.

It is an arithmetic number, because the mean of its divisors is an integer number (1803961).

Almost surely, 2^3607921 is an apocalyptic number.

It is an amenable number.

3607921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3607921 is an equidigital number, since it uses as much as digits as its factorization.

3607921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 3607921 is about 1899.4528159446. The cubic root of 3607921 is about 153.3742103787.

It can be divided in two parts, 36079 and 21, that added together give a square (36100 = 190²).

The spelling of 3607921 in words is "three million, six hundred seven thousand, nine hundred twenty-one".