400206553 has 4 divisors (see below), whose sum is σ = 401651620. Its totient is φ = 398761488.

The previous prime is 400206539. The next prime is 400206581. The reversal of 400206553 is 355602004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 159087769 + 241118784 = 12613^2 + 15528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400206553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400206353) 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, 722118 + ... + 722671.

It is an arithmetic number, because the mean of its divisors is an integer number (100412905).

Almost surely, 2^400206553 is an apocalyptic number.

It is an amenable number.

400206553 is a deficient number, since it is larger than the sum of its proper divisors (1445067).

400206553 is a wasteful number, since it uses less digits than its factorization.

400206553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445066.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 400206553 is about 20005.1631585448. The cubic root of 400206553 is about 736.9331025307.

Adding to 400206553 its reverse (355602004), we get a palindrome (755808557).

The spelling of 400206553 in words is "four hundred million, two hundred six thousand, five hundred fifty-three".