4007440 has 20 divisors (see below), whose sum is σ = 9317484. Its totient is φ = 1602944.

The previous prime is 4007431. The next prime is 4007441. The reversal of 4007440 is 447004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 665856 + 3341584 = 816^2 + 1828^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (4007441) 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, 24967 + ... + 25126.

Almost surely, 2^4007440 is an apocalyptic number.

4007440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4007440 is an abundant number, since it is smaller than the sum of its proper divisors (5310044).

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

4007440 is a wasteful number, since it uses less digits than its factorization.

4007440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50106 (or 50100 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 4007440 is about 2001.8591359034. The cubic root of 4007440 is about 158.8384631053.

The spelling of 4007440 in words is "four million, seven thousand, four hundred forty".