40042420 has 24 divisors (see below), whose sum is σ = 91734048. Its totient is φ = 14560800.

The previous prime is 40042411. The next prime is 40042423. The reversal of 40042420 is 2424004.

It is a super-3 number, since 3×40042420³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40042394 and 40042403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90786 + ... + 91225.

It is an arithmetic number, because the mean of its divisors is an integer number (3822252).

Almost surely, 2^40042420 is an apocalyptic number.

It is an amenable number.

40042420 is an abundant number, since it is smaller than the sum of its proper divisors (51691628).

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

40042420 is a wasteful number, since it uses less digits than its factorization.

40042420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182031 (or 182029 counting only the distinct ones).

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

The square root of 40042420 is about 6327.9080271445. The cubic root of 40042420 is about 342.1160419234.

Adding to 40042420 its reverse (2424004), we get a palindrome (42466424).

The spelling of 40042420 in words is "forty million, forty-two thousand, four hundred twenty".