400400003 has 8 divisors (see below), whose sum is σ = 410377728. Its totient is φ = 390483144.

The previous prime is 400399949. The next prime is 400400041. The reversal of 400400003 is 300004004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400400003 - 2¹⁰ = 400398979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400405003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1751 + ... + 28352.

It is an arithmetic number, because the mean of its divisors is an integer number (51297216).

Almost surely, 2^400400003 is an apocalyptic number.

400400003 is a deficient number, since it is larger than the sum of its proper divisors (9977725).

400400003 is a wasteful number, since it uses less digits than its factorization.

400400003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30433.

The product of its (nonzero) digits is 48, while the sum is 11.

The square root of 400400003 is about 20009.9975762117. The cubic root of 400400003 is about 737.0518218469.

Adding to 400400003 its reverse (300004004), we get a palindrome (700404007).

The spelling of 400400003 in words is "four hundred million, four hundred thousand, three".