3949440 has 192 divisors, whose sum is σ = 14651280. Its totient is φ = 901120.

The previous prime is 3949433. The next prime is 3949441. The reversal of 3949440 is 449493.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3949441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232312 + ... + 232328.

Almost surely, 2^3949440 is an apocalyptic number.

3949440 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 3949440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7325640).

3949440 is an abundant number, since it is smaller than the sum of its proper divisors (10701840).

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

3949440 is a wasteful number, since it uses less digits than its factorization.

3949440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 3949440 is about 1987.3198031520. The cubic root of 3949440 is about 158.0684422809.

The spelling of 3949440 in words is "three million, nine hundred forty-nine thousand, four hundred forty".