400212451 has 4 divisors (see below), whose sum is σ = 400326304. Its totient is φ = 400098600.

The previous prime is 400212437. The next prime is 400212457. The reversal of 400212451 is 154212004.

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 400212451 - 2¹⁵ = 400179683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400212457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51480 + ... + 58741.

It is an arithmetic number, because the mean of its divisors is an integer number (100081576).

Almost surely, 2^400212451 is an apocalyptic number.

400212451 is a deficient number, since it is larger than the sum of its proper divisors (113853).

400212451 is a wasteful number, since it uses less digits than its factorization.

400212451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113852.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 400212451 is about 20005.3105699462. The cubic root of 400212451 is about 736.9367226697.

Adding to 400212451 its reverse (154212004), we get a palindrome (554424455).

The spelling of 400212451 in words is "four hundred million, two hundred twelve thousand, four hundred fifty-one".