3945240 has 128 divisors (see below), whose sum is σ = 14212800. Its totient is φ = 967680.

The previous prime is 3945233. The next prime is 3945287. The reversal of 3945240 is 425493.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13900 + ... + 14180.

Almost surely, 2^3945240 is an apocalyptic number.

3945240 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 3945240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7106400).

3945240 is an abundant number, since it is smaller than the sum of its proper divisors (10267560).

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

3945240 is a wasteful number, since it uses less digits than its factorization.

3945240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 3945240 is about 1986.2628224885. The cubic root of 3945240 is about 158.0123902050.

The spelling of 3945240 in words is "three million, nine hundred forty-five thousand, two hundred forty".