3937645 has 4 divisors (see below), whose sum is σ = 4725180. Its totient is φ = 3150112.

The previous prime is 3937643. The next prime is 3937673. The reversal of 3937645 is 5467393.

3937645 = 623² + 624² + ... + 632².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5467393 = 1031 ⋅5303.

It can be written as a sum of positive squares in 2 ways, for example, as 2566404 + 1371241 = 1602^2 + 1171^2 .

It is a cyclic number.

It is not a de Polignac number, because 3937645 - 2¹ = 3937643 is a prime.

It is a super-3 number, since 3×3937645³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3937643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393760 + ... + 393769.

It is an arithmetic number, because the mean of its divisors is an integer number (1181295).

Almost surely, 2^3937645 is an apocalyptic number.

It is an amenable number.

3937645 is a deficient number, since it is larger than the sum of its proper divisors (787535).

3937645 is an equidigital number, since it uses as much as digits as its factorization.

3937645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787534.

The product of its digits is 68040, while the sum is 37.

The square root of 3937645 is about 1984.3500195278. The cubic root of 3937645 is about 157.9109282714.

The spelling of 3937645 in words is "three million, nine hundred thirty-seven thousand, six hundred forty-five".