3721540 has 24 divisors (see below), whose sum is σ = 7925400. Its totient is φ = 1467648.

The previous prime is 3721537. The next prime is 3721559. The reversal of 3721540 is 451273.

3721540 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1218816 + 2502724 = 1104^2 + 1582^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186 + ... + 2734.

It is an arithmetic number, because the mean of its divisors is an integer number (330225).

Almost surely, 2^3721540 is an apocalyptic number.

It is an amenable number.

3721540 is an abundant number, since it is smaller than the sum of its proper divisors (4203860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3721540 is a wasteful number, since it uses less digits than its factorization.

3721540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631 (or 2629 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 3721540 is about 1929.1293372918. The cubic root of 3721540 is about 154.9675964174.

The spelling of 3721540 in words is "three million, seven hundred twenty-one thousand, five hundred forty".