3954640 has 20 divisors (see below), whose sum is σ = 9194724. Its totient is φ = 1581824.

The previous prime is 3954637. The next prime is 3954649. The reversal of 3954640 is 464593.

It can be written as a sum of positive squares in 2 ways, for example, as 2039184 + 1915456 = 1428^2 + 1384^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3954649) 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, 24637 + ... + 24796.

Almost surely, 2^3954640 is an apocalyptic number.

It is an amenable number.

3954640 is an abundant number, since it is smaller than the sum of its proper divisors (5240084).

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

3954640 is a wasteful number, since it uses less digits than its factorization.

3954640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49446 (or 49440 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 3954640 is about 1988.6276675135. The cubic root of 3954640 is about 158.1377850588.

The spelling of 3954640 in words is "three million, nine hundred fifty-four thousand, six hundred forty".