4390040 has 16 divisors (see below), whose sum is σ = 9877680. Its totient is φ = 1756000.

The previous prime is 4390039. The next prime is 4390051. The reversal of 4390040 is 400934.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 4389994 and 4390021.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54836 + ... + 54915.

It is an arithmetic number, because the mean of its divisors is an integer number (617355).

Almost surely, 2^4390040 is an apocalyptic number.

4390040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4390040 is an abundant number, since it is smaller than the sum of its proper divisors (5487640).

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

4390040 is a wasteful number, since it uses less digits than its factorization.

4390040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109762 (or 109758 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 4390040 is about 2095.2422294332. The cubic root of 4390040 is about 163.7405176802.

Adding to 4390040 its reverse (400934), we get a palindrome (4790974).

The spelling of 4390040 in words is "four million, three hundred ninety thousand, forty".