3977440 has 24 divisors (see below), whose sum is σ = 9397080. Its totient is φ = 1590912.

The previous prime is 3977431. The next prime is 3977447. The reversal of 3977440 is 447793.

It is a junction number, because it is equal to n+sod(n) for n = 3977396 and 3977405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3977447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12270 + ... + 12589.

It is an arithmetic number, because the mean of its divisors is an integer number (391545).

Almost surely, 2^3977440 is an apocalyptic number.

It is an amenable number.

3977440 is an abundant number, since it is smaller than the sum of its proper divisors (5419640).

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

3977440 is a wasteful number, since it uses less digits than its factorization.

3977440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24874 (or 24866 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 3977440 is about 1994.3520250949. The cubic root of 3977440 is about 158.4411109834.

The spelling of 3977440 in words is "three million, nine hundred seventy-seven thousand, four hundred forty".