400374217 has 4 divisors (see below), whose sum is σ = 400416660. Its totient is φ = 400331776.

The previous prime is 400374209. The next prime is 400374223. The reversal of 400374217 is 712473004.

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 283215241 + 117158976 = 16829^2 + 10824^2 .

It is a cyclic number.

It is not a de Polignac number, because 400374217 - 2³ = 400374209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400374257) 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, 9 + ... + 28297.

It is an arithmetic number, because the mean of its divisors is an integer number (100104165).

Almost surely, 2^400374217 is an apocalyptic number.

It is an amenable number.

400374217 is a deficient number, since it is larger than the sum of its proper divisors (42443).

400374217 is a wasteful number, since it uses less digits than its factorization.

400374217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42442.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 400374217 is about 20009.3532379235. The cubic root of 400374217 is about 737.0359993143.

The spelling of 400374217 in words is "four hundred million, three hundred seventy-four thousand, two hundred seventeen".