400272121 has 4 divisors (see below), whose sum is σ = 400312692. Its totient is φ = 400231552.

The previous prime is 400272097. The next prime is 400272139. The reversal of 400272121 is 121272004.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 264875625 + 135396496 = 16275^2 + 11636^2 .

It is a cyclic number.

It is not a de Polignac number, because 400272121 - 2⁹ = 400271609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400272421) 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, 5121 + ... + 28753.

It is an arithmetic number, because the mean of its divisors is an integer number (100078173).

Almost surely, 2^400272121 is an apocalyptic number.

It is an amenable number.

400272121 is a deficient number, since it is larger than the sum of its proper divisors (40571).

400272121 is a wasteful number, since it uses less digits than its factorization.

400272121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40570.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 400272121 is about 20006.8018683647. The cubic root of 400272121 is about 736.9733455758.

The spelling of 400272121 in words is "four hundred million, two hundred seventy-two thousand, one hundred twenty-one".