400120203 has 32 divisors (see below), whose sum is σ = 626999296. Its totient is φ = 222209568.

The previous prime is 400120169. The next prime is 400120207. The reversal of 400120203 is 302021004.

It is not a de Polignac number, because 400120203 - 2⁶ = 400120139 is a prime.

It is a super-2 number, since 2×400120203² = 320192353697522418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400120207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200376 + ... + 202362.

It is an arithmetic number, because the mean of its divisors is an integer number (19593728).

Almost surely, 2^400120203 is an apocalyptic number.

400120203 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

400120203 is a deficient number, since it is larger than the sum of its proper divisors (226879093).

400120203 is a wasteful number, since it uses less digits than its factorization.

400120203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 400120203 is about 20003.0048492720. The cubic root of 400120203 is about 736.8800976093.

Adding to 400120203 its reverse (302021004), we get a palindrome (702141207).

The spelling of 400120203 in words is "four hundred million, one hundred twenty thousand, two hundred three".