3940651 has 16 divisors (see below), whose sum is σ = 4904928. Its totient is φ = 3110400.

The previous prime is 3940637. The next prime is 3940663. The reversal of 3940651 is 1560493.

It is a 9-Lehmer number, since φ(3940651) divides (3940651-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 3940651 - 2⁷ = 3940523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3940631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621 + ... + 3241.

It is an arithmetic number, because the mean of its divisors is an integer number (306558).

Almost surely, 2^3940651 is an apocalyptic number.

3940651 is the 1621-st pentagonal number.

3940651 is a deficient number, since it is larger than the sum of its proper divisors (964277).

3940651 is a wasteful number, since it uses less digits than its factorization.

3940651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 3940651 is about 1985.1073018857. The cubic root of 3940651 is about 157.9511011421.

The spelling of 3940651 in words is "three million, nine hundred forty thousand, six hundred fifty-one".