400820633 has 4 divisors (see below), whose sum is σ = 410596788. Its totient is φ = 391044480.

The previous prime is 400820627. The next prime is 400820639. The reversal of 400820633 is 336028004.

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

It is an interprime number because it is at equal distance from previous prime (400820627) and next prime (400820639).

It can be written as a sum of positive squares in 2 ways, for example, as 155052304 + 245768329 = 12452^2 + 15677^2 .

It is a cyclic number.

It is not a de Polignac number, because 400820633 - 2⁴ = 400820617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400820639) 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, 4888016 + ... + 4888097.

It is an arithmetic number, because the mean of its divisors is an integer number (102649197).

Almost surely, 2^400820633 is an apocalyptic number.

It is an amenable number.

400820633 is a deficient number, since it is larger than the sum of its proper divisors (9776155).

400820633 is an equidigital number, since it uses as much as digits as its factorization.

400820633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9776154.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 400820633 is about 20020.5053133032. The cubic root of 400820633 is about 737.3098285114.

Adding to 400820633 its reverse (336028004), we get a palindrome (736848637).

The spelling of 400820633 in words is "four hundred million, eight hundred twenty thousand, six hundred thirty-three".