3907221 has 8 divisors (see below), whose sum is σ = 5221344. Its totient is φ = 2598960.

The previous prime is 3907219. The next prime is 3907231. The reversal of 3907221 is 1227093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3907221 - 2¹ = 3907219 is a prime.

3907221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3907191 and 3907200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3907231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451 + ... + 2831.

It is an arithmetic number, because the mean of its divisors is an integer number (652668).

Almost surely, 2^3907221 is an apocalyptic number.

It is an amenable number.

3907221 is a deficient number, since it is larger than the sum of its proper divisors (1314123).

3907221 is a wasteful number, since it uses less digits than its factorization.

3907221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 3907221 is about 1976.6691680704. The cubic root of 3907221 is about 157.5031795780.

It can be divided in two parts, 39072 and 21, that added together give a palindrome (39093).

The spelling of 3907221 in words is "three million, nine hundred seven thousand, two hundred twenty-one".