3721545 has 28 divisors (see below), whose sum is σ = 6702276. Its totient is φ = 1982880.

The previous prime is 3721537. The next prime is 3721559. The reversal of 3721545 is 5451273.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1750329 + 1971216 = 1323^2 + 1404^2 .

It is not a de Polignac number, because 3721545 - 2³ = 3721537 is a prime.

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

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

It is a Curzon number.

3721545 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3135 + ... + 4155.

It is an arithmetic number, because the mean of its divisors is an integer number (239367).

Almost surely, 2^3721545 is an apocalyptic number.

It is an amenable number.

3721545 is a deficient number, since it is larger than the sum of its proper divisors (2980731).

3721545 is an equidigital number, since it uses as much as digits as its factorization.

3721545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1029 counting only the distinct ones).

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

The square root of 3721545 is about 1929.1306332128. The cubic root of 3721545 is about 154.9676658186.

The spelling of 3721545 in words is "three million, seven hundred twenty-one thousand, five hundred forty-five".