400206842 has 16 divisors (see below), whose sum is σ = 722178240. Its totient is φ = 162489888.

The previous prime is 400206841. The next prime is 400206847. The reversal of 400206842 is 248602004.

It is a super-2 number, since 2×400206842² = 320331032767225928, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400206841) 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, 752003 + ... + 752534.

It is an arithmetic number, because the mean of its divisors is an integer number (45136140).

Almost surely, 2^400206842 is an apocalyptic number.

400206842 is a deficient number, since it is larger than the sum of its proper divisors (321971398).

400206842 is a wasteful number, since it uses less digits than its factorization.

400206842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504565.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 400206842 is about 20005.1703816788. The cubic root of 400206842 is about 736.9332799171.

Adding to 400206842 its reverse (248602004), we get a palindrome (648808846).

The spelling of 400206842 in words is "four hundred million, two hundred six thousand, eight hundred forty-two".