40021003 has 16 divisors (see below), whose sum is σ = 44998272. Its totient is φ = 35280000.

The previous prime is 40021001. The next prime is 40021021. The reversal of 40021003 is 30012004.

It is a cyclic number.

It is not a de Polignac number, because 40021003 - 2¹ = 40021001 is a prime.

It is a super-2 number, since 2×40021003² = 3203361362252018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40021001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99603 + ... + 100003.

It is an arithmetic number, because the mean of its divisors is an integer number (2812392).

Almost surely, 2^40021003 is an apocalyptic number.

40021003 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

40021003 is a deficient number, since it is larger than the sum of its proper divisors (4977269).

40021003 is a wasteful number, since it uses less digits than its factorization.

40021003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 40021003 is about 6326.2155353734. The cubic root of 40021003 is about 342.0550365698.

Adding to 40021003 its reverse (30012004), we get a palindrome (70033007).

It can be divided in two parts, 4002 and 1003, that added together give a palindrome (5005).

The spelling of 40021003 in words is "forty million, twenty-one thousand, three".