400123213 has 8 divisors (see below), whose sum is σ = 467918528. Its totient is φ = 334986624.

The previous prime is 400123201. The next prime is 400123219. The reversal of 400123213 is 312321004.

It is a happy number.

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

It is not a de Polignac number, because 400123213 - 2¹³ = 400115021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400123219) 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 7 ways as a sum of consecutive naturals, for example, 664356 + ... + 664957.

It is an arithmetic number, because the mean of its divisors is an integer number (58489816).

Almost surely, 2^400123213 is an apocalyptic number.

400123213 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

It is an amenable number.

400123213 is a deficient number, since it is larger than the sum of its proper divisors (67795315).

400123213 is a wasteful number, since it uses less digits than its factorization.

400123213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329363.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 400123213 is about 20003.0800878265. The cubic root of 400123213 is about 736.8819453903.

Adding to 400123213 its reverse (312321004), we get a palindrome (712444217).

The spelling of 400123213 in words is "four hundred million, one hundred twenty-three thousand, two hundred thirteen".