400542003 has 24 divisors (see below), whose sum is σ = 606209968. Its totient is φ = 264259584.

The previous prime is 400542001. The next prime is 400542017. The reversal of 400542003 is 300245004.

It is a happy number.

It is not a de Polignac number, because 400542003 - 2¹ = 400542001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400542001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15075 + ... + 32067.

Almost surely, 2^400542003 is an apocalyptic number.

400542003 is a deficient number, since it is larger than the sum of its proper divisors (205667965).

400542003 is an equidigital number, since it uses as much as digits as its factorization.

400542003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17105 (or 17093 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 400542003 is about 20013.5454879939. The cubic root of 400542003 is about 737.1389422163.

Adding to 400542003 its reverse (300245004), we get a palindrome (700787007).

The spelling of 400542003 in words is "four hundred million, five hundred forty-two thousand, three".