400206061 has 8 divisors (see below), whose sum is σ = 438360120. Its totient is φ = 363675648.

The previous prime is 400206019. The next prime is 400206067. The reversal of 400206061 is 160602004.

It can be written as a sum of positive squares in 4 ways, for example, as 16281225 + 383924836 = 4035^2 + 19594^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 400206061 - 2⁹ = 400205549 is a prime.

It is a super-2 number, since 2×400206061² = 320329782522271442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400206067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405396 + ... + 406381.

It is an arithmetic number, because the mean of its divisors is an integer number (54795015).

Almost surely, 2^400206061 is an apocalyptic number.

It is an amenable number.

400206061 is a deficient number, since it is larger than the sum of its proper divisors (38154059).

400206061 is a wasteful number, since it uses less digits than its factorization.

400206061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811823.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 400206061 is about 20005.1508617156. The cubic root of 400206061 is about 736.9328005439.

Adding to 400206061 its reverse (160602004), we get a palindrome (560808065).

The spelling of 400206061 in words is "four hundred million, two hundred six thousand, sixty-one".