40015420 has 48 divisors (see below), whose sum is σ = 87429888. Its totient is φ = 15367680.

The previous prime is 40015403. The next prime is 40015421. The reversal of 40015420 is 2451004.

It is a junction number, because it is equal to n+sod(n) for n = 40015394 and 40015403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40015421) 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, 144322 + ... + 144598.

It is an arithmetic number, because the mean of its divisors is an integer number (1821456).

Almost surely, 2^40015420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40015420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43714944).

40015420 is an abundant number, since it is smaller than the sum of its proper divisors (47414468).

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

40015420 is a wasteful number, since it uses less digits than its factorization.

40015420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 40015420 is about 6325.7742609107. The cubic root of 40015420 is about 342.0391300713.

Adding to 40015420 its reverse (2451004), we get a palindrome (42466424).

The spelling of 40015420 in words is "forty million, fifteen thousand, four hundred twenty".