3901645 has 12 divisors (see below), whose sum is σ = 5147100. Its totient is φ = 2837120.

The previous prime is 3901609. The next prime is 3901649. The reversal of 3901645 is 5461093.

It can be written as a sum of positive squares in 2 ways, for example, as 2832489 + 1069156 = 1683^2 + 1034^2 .

It is not a de Polignac number, because 3901645 - 2²¹ = 1804493 is a prime.

It is a super-3 number, since 3×3901645³ (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 (3901649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2620 + ... + 3829.

It is an arithmetic number, because the mean of its divisors is an integer number (428925).

Almost surely, 2^3901645 is an apocalyptic number.

It is an amenable number.

3901645 is a deficient number, since it is larger than the sum of its proper divisors (1245455).

3901645 is a wasteful number, since it uses less digits than its factorization.

3901645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6476 (or 6465 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 3901645 is about 1975.2582109689. The cubic root of 3901645 is about 157.4282195797.

The spelling of 3901645 in words is "three million, nine hundred one thousand, six hundred forty-five".