400225451 has 4 divisors (see below), whose sum is σ = 402299352. Its totient is φ = 398151552.

The previous prime is 400225447. The next prime is 400225457. The reversal of 400225451 is 154522004.

It is a happy number.

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 400225451 - 2² = 400225447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400225457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1036661 + ... + 1037046.

It is an arithmetic number, because the mean of its divisors is an integer number (100574838).

Almost surely, 2^400225451 is an apocalyptic number.

400225451 is a deficient number, since it is larger than the sum of its proper divisors (2073901).

400225451 is a wasteful number, since it uses less digits than its factorization.

400225451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073900.

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

The square root of 400225451 is about 20005.6354810338. The cubic root of 400225451 is about 736.9447018265.

Adding to 400225451 its reverse (154522004), we get a palindrome (554747455).

The spelling of 400225451 in words is "four hundred million, two hundred twenty-five thousand, four hundred fifty-one".