400531451 has 4 divisors (see below), whose sum is σ = 401264232. Its totient is φ = 399798672.

The previous prime is 400531447. The next prime is 400531463. The reversal of 400531451 is 154135004.

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 400531451 - 2² = 400531447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400531421) 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, 365570 + ... + 366663.

It is an arithmetic number, because the mean of its divisors is an integer number (100316058).

Almost surely, 2^400531451 is an apocalyptic number.

400531451 is a deficient number, since it is larger than the sum of its proper divisors (732781).

400531451 is an equidigital number, since it uses as much as digits as its factorization.

400531451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732780.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 400531451 is about 20013.2818648017. The cubic root of 400531451 is about 737.1324690222.

Adding to 400531451 its reverse (154135004), we get a palindrome (554666455).

The spelling of 400531451 in words is "four hundred million, five hundred thirty-one thousand, four hundred fifty-one".