40003020 has 144 divisors (see below), whose sum is σ = 128314368. Its totient is φ = 10074240.

The previous prime is 40003009. The next prime is 40003027. The reversal of 40003020 is 2030004.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 40002993 and 40003011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40003027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 373807 + ... + 373913.

It is an arithmetic number, because the mean of its divisors is an integer number (891072).

Almost surely, 2^40003020 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 40003020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64157184).

40003020 is an abundant number, since it is smaller than the sum of its proper divisors (88311348).

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

40003020 is a wasteful number, since it uses less digits than its factorization.

40003020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 40003020 is about 6324.7940677938. The cubic root of 40003020 is about 342.0037959977.

Adding to 40003020 its reverse (2030004), we get a palindrome (42033024).

The spelling of 40003020 in words is "forty million, three thousand, twenty".