3921637 has 2 divisors, whose sum is σ = 3921638. Its totient is φ = 3921636.

The previous prime is 3921601. The next prime is 3921649. The reversal of 3921637 is 7361293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2735716 + 1185921 = 1654^2 + 1089^2 .

It is an emirp because it is prime and its reverse (7361293) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3921637 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3921599 and 3921608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3921677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960818 + 1960819.

It is an arithmetic number, because the mean of its divisors is an integer number (1960819).

Almost surely, 2^3921637 is an apocalyptic number.

It is an amenable number.

3921637 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921637 is an equidigital number, since it uses as much as digits as its factorization.

3921637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 31.

The square root of 3921637 is about 1980.3123491005. The cubic root of 3921637 is about 157.6966486335.

The spelling of 3921637 in words is "three million, nine hundred twenty-one thousand, six hundred thirty-seven".