3740721 has 4 divisors (see below), whose sum is σ = 4987632. Its totient is φ = 2493812.

The previous prime is 3740707. The next prime is 3740747. The reversal of 3740721 is 1270473.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3740721 - 2⁵ = 3740689 is a prime.

It is a D-number.

3740721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3740691 and 3740700.

It is not an unprimeable number, because it can be changed into a prime (3740021) 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, 623451 + ... + 623456.

It is an arithmetic number, because the mean of its divisors is an integer number (1246908).

Almost surely, 2^3740721 is an apocalyptic number.

It is an amenable number.

3740721 is a deficient number, since it is larger than the sum of its proper divisors (1246911).

3740721 is a wasteful number, since it uses less digits than its factorization.

3740721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246910.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 3740721 is about 1934.0943617104. The cubic root of 3740721 is about 155.2333771919.

The spelling of 3740721 in words is "three million, seven hundred forty thousand, seven hundred twenty-one".