40402420 has 24 divisors (see below), whose sum is σ = 85342824. Its totient is φ = 16066176.

The previous prime is 40402403. The next prime is 40402441. The reversal of 40402420 is 2420404.

It can be written as a sum of positive squares in 4 ways, for example, as 19131876 + 21270544 = 4374^2 + 4612^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40402394 and 40402403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2379 + ... + 9298.

It is an arithmetic number, because the mean of its divisors is an integer number (3555951).

Almost surely, 2^40402420 is an apocalyptic number.

It is an amenable number.

40402420 is an abundant number, since it is smaller than the sum of its proper divisors (44940404).

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

40402420 is a wasteful number, since it uses less digits than its factorization.

40402420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11859 (or 11857 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 40402420 is about 6356.2897983022. The cubic root of 40402420 is about 343.1382454910.

Adding to 40402420 its reverse (2420404), we get a palindrome (42822824).

The spelling of 40402420 in words is "forty million, four hundred two thousand, four hundred twenty".