400940553 has 8 divisors (see below), whose sum is σ = 575709568. Its totient is φ = 246732624.

The previous prime is 400940549. The next prime is 400940587. The reversal of 400940553 is 355049004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400940553 - 2² = 400940549 is a prime.

It is the 20024-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400940553.

It is not an unprimeable number, because it can be changed into a prime (400940543) by changing a digit.

It is a nontrivial repunit in base 20023.

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 7 ways as a sum of consecutive naturals, for example, 5140225 + ... + 5140302.

It is an arithmetic number, because the mean of its divisors is an integer number (71963696).

Almost surely, 2^400940553 is an apocalyptic number.

It is an amenable number.

400940553 is a deficient number, since it is larger than the sum of its proper divisors (174769015).

400940553 is a wasteful number, since it uses less digits than its factorization.

400940553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10280543.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 400940553 is about 20023.5000187280. The cubic root of 400940553 is about 737.3833521535.

Adding to 400940553 its reverse (355049004), we get a palindrome (755989557).

The spelling of 400940553 in words is "four hundred million, nine hundred forty thousand, five hundred fifty-three".