3911640 has 64 divisors (see below), whose sum is σ = 12065760. Its totient is φ = 1013760.

The previous prime is 3911627. The next prime is 3911647. The reversal of 3911640 is 461193.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 3911640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3911647) 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, 4000 + ... + 4880.

Almost surely, 2^3911640 is an apocalyptic number.

3911640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3911640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6032880).

3911640 is an abundant number, since it is smaller than the sum of its proper divisors (8154120).

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

3911640 is a wasteful number, since it uses less digits than its factorization.

3911640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 3911640 is about 1977.7866416780. The cubic root of 3911640 is about 157.5625350061.

The spelling of 3911640 in words is "three million, nine hundred eleven thousand, six hundred forty".