400554221 has 8 divisors (see below), whose sum is σ = 424305720. Its totient is φ = 376823808.

The previous prime is 400554197. The next prime is 400554251. The reversal of 400554221 is 122455004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 48804196 + 351750025 = 6986^2 + 18755^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 400554221 - 2⁶ = 400554157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400554251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51245 + ... + 58541.

It is an arithmetic number, because the mean of its divisors is an integer number (53038215).

Almost surely, 2^400554221 is an apocalyptic number.

It is an amenable number.

400554221 is a deficient number, since it is larger than the sum of its proper divisors (23751499).

400554221 is a wasteful number, since it uses less digits than its factorization.

400554221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10543.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 400554221 is about 20013.8507289327. The cubic root of 400554221 is about 737.1464372871.

The spelling of 400554221 in words is "four hundred million, five hundred fifty-four thousand, two hundred twenty-one".