40420520 has 64 divisors (see below), whose sum is σ = 104544000. Its totient is φ = 13777920.

The previous prime is 40420493. The next prime is 40420529. The reversal of 40420520 is 2502404.

It is not an unprimeable number, because it can be changed into a prime (40420529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67181 + ... + 67779.

It is an arithmetic number, because the mean of its divisors is an integer number (1633500).

Almost surely, 2^40420520 is an apocalyptic number.

40420520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40420520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52272000).

40420520 is an abundant number, since it is smaller than the sum of its proper divisors (64123480).

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

40420520 is a wasteful number, since it uses less digits than its factorization.

40420520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 40420520 is about 6357.7134254384. The cubic root of 40420520 is about 343.1894790145.

Adding to 40420520 its reverse (2502404), we get a palindrome (42922924).

The spelling of 40420520 in words is "forty million, four hundred twenty thousand, five hundred twenty".