400323121 has 4 divisors (see below), whose sum is σ = 436716144. Its totient is φ = 363930100.

The previous prime is 400323071. The next prime is 400323137. The reversal of 400323121 is 121323004.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400323121 - 2¹⁷ = 400192049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400323095 and 400323104.

It is not an unprimeable number, because it can be changed into a prime (400323821) 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, 18196495 + ... + 18196516.

It is an arithmetic number, because the mean of its divisors is an integer number (109179036).

Almost surely, 2^400323121 is an apocalyptic number.

It is an amenable number.

400323121 is a deficient number, since it is larger than the sum of its proper divisors (36393023).

400323121 is a wasteful number, since it uses less digits than its factorization.

400323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36393022.

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

The square root of 400323121 is about 20008.0763942964. The cubic root of 400323121 is about 737.0046443202.

Adding to 400323121 its reverse (121323004), we get a palindrome (521646125).

The spelling of 400323121 in words is "four hundred million, three hundred twenty-three thousand, one hundred twenty-one".