40420405240 has 32 divisors (see below), whose sum is σ = 93879653760. Its totient is φ = 15646608000.

The previous prime is 40420405237. The next prime is 40420405243. The reversal of 40420405240 is 4250402404.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40420405237) and next prime (40420405243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40420405243) 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, 16297311 + ... + 16299790.

It is an arithmetic number, because the mean of its divisors is an integer number (2933739180).

Almost surely, 2^40420405240 is an apocalyptic number.

40420405240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40420405240 is an abundant number, since it is smaller than the sum of its proper divisors (53459248520).

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

40420405240 is a wasteful number, since it uses less digits than its factorization.

40420405240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32597143 (or 32597139 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

Adding to 40420405240 its reverse (4250402404), we get a palindrome (44670807644).

The spelling of 40420405240 in words is "forty billion, four hundred twenty million, four hundred five thousand, two hundred forty".