400001860 has 12 divisors (see below), whose sum is σ = 840003948. Its totient is φ = 160000736.

The previous prime is 400001831. The next prime is 400001881. The reversal of 400001860 is 68100004.

It can be written as a sum of positive squares in 2 ways, for example, as 239878144 + 160123716 = 15488^2 + 12654^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10000027 + ... + 10000066.

It is an arithmetic number, because the mean of its divisors is an integer number (70000329).

Almost surely, 2^400001860 is an apocalyptic number.

It is an amenable number.

400001860 is an abundant number, since it is smaller than the sum of its proper divisors (440002088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400001860 is a wasteful number, since it uses less digits than its factorization.

400001860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20000102 (or 20000100 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 400001860 is about 20000.0464999459. The cubic root of 400001860 is about 736.8074417761.

Adding to 400001860 its reverse (68100004), we get a palindrome (468101864).

The spelling of 400001860 in words is "four hundred million, one thousand, eight hundred sixty".