3959440 has 40 divisors (see below), whose sum is σ = 9427968. Its totient is φ = 1545600.

The previous prime is 3959393. The next prime is 3959441. The reversal of 3959440 is 449593.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×3959440² = 31354330227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3959396 and 3959405.

It is not an unprimeable number, because it can be changed into a prime (3959441) 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, 2865 + ... + 4015.

Almost surely, 2^3959440 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 3959440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4713984).

3959440 is an abundant number, since it is smaller than the sum of its proper divisors (5468528).

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

3959440 is a wasteful number, since it uses less digits than its factorization.

3959440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 3959440 is about 1989.8341639443. The cubic root of 3959440 is about 158.2017398451.

The spelling of 3959440 in words is "three million, nine hundred fifty-nine thousand, four hundred forty".