400420403 has 4 divisors (see below), whose sum is σ = 405905688. Its totient is φ = 394935120.

The previous prime is 400420399. The next prime is 400420411. The reversal of 400420403 is 304024004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400420403 - 2² = 400420399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400420453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2742533 + ... + 2742678.

It is an arithmetic number, because the mean of its divisors is an integer number (101476422).

Almost surely, 2^400420403 is an apocalyptic number.

400420403 is a deficient number, since it is larger than the sum of its proper divisors (5485285).

400420403 is an equidigital number, since it uses as much as digits as its factorization.

400420403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5485284.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 400420403 is about 20010.5073149083. The cubic root of 400420403 is about 737.0643389978.

Adding to 400420403 its reverse (304024004), we get a palindrome (704444407).

The spelling of 400420403 in words is "four hundred million, four hundred twenty thousand, four hundred three".