400225643 has 4 divisors (see below), whose sum is σ = 401299008. Its totient is φ = 399152280.

The previous prime is 400225627. The next prime is 400225649. The reversal of 400225643 is 346522004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400225643 - 2⁴ = 400225627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400225649) 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, 536123 + ... + 536868.

It is an arithmetic number, because the mean of its divisors is an integer number (100324752).

Almost surely, 2^400225643 is an apocalyptic number.

400225643 is a deficient number, since it is larger than the sum of its proper divisors (1073365).

400225643 is a wasteful number, since it uses less digits than its factorization.

400225643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073364.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 400225643 is about 20005.6402796811. The cubic root of 400225643 is about 736.9448196712.

Adding to 400225643 its reverse (346522004), we get a palindrome (746747647).

The spelling of 400225643 in words is "four hundred million, two hundred twenty-five thousand, six hundred forty-three".