3745521 has 20 divisors (see below), whose sum is σ = 6027252. Its totient is φ = 2304288.

The previous prime is 3745519. The next prime is 3745529. The reversal of 3745521 is 1255473.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 505521 + 3240000 = 711^2 + 1800^2 .

It is not a de Polignac number, because 3745521 - 2¹ = 3745519 is a prime.

It is a super-2 number, since 2×3745521² = 28057855122882, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is an Ulam number.

3745521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3745529) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 726 + ... + 2831.

Almost surely, 2^3745521 is an apocalyptic number.

It is an amenable number.

3745521 is a deficient number, since it is larger than the sum of its proper divisors (2281731).

3745521 is a wasteful number, since it uses less digits than its factorization.

3745521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582 (or 3573 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 3745521 is about 1935.3348547474. The cubic root of 3745521 is about 155.2997460132.

The spelling of 3745521 in words is "three million, seven hundred forty-five thousand, five hundred twenty-one".