3951640 has 64 divisors (see below), whose sum is σ = 11093760. Its totient is φ = 1230720.

The previous prime is 3951611. The next prime is 3951707. The reversal of 3951640 is 461593.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 3951599 and 3951608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2439 + ... + 3721.

It is an arithmetic number, because the mean of its divisors is an integer number (173340).

Almost surely, 2^3951640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3951640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5546880).

3951640 is an abundant number, since it is smaller than the sum of its proper divisors (7142120).

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

3951640 is a wasteful number, since it uses less digits than its factorization.

3951640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312 (or 1308 counting only the distinct ones).

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

The square root of 3951640 is about 1987.8732353951. The cubic root of 3951640 is about 158.0977870338.

The spelling of 3951640 in words is "three million, nine hundred fifty-one thousand, six hundred forty".