400009124 has 12 divisors (see below), whose sum is σ = 700203504. Its totient is φ = 199950984.

The previous prime is 400009097. The next prime is 400009163. The reversal of 400009124 is 421900004.

It is a junction number, because it is equal to n+sod(n) for n = 400009096 and 400009105.

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, 6779 + ... + 29085.

It is an arithmetic number, because the mean of its divisors is an integer number (58350292).

Almost surely, 2^400009124 is an apocalyptic number.

It is an amenable number.

400009124 is a deficient number, since it is larger than the sum of its proper divisors (300194380).

400009124 is a wasteful number, since it uses less digits than its factorization.

400009124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26794 (or 26792 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 400009124 is about 20000.2280986993. The cubic root of 400009124 is about 736.8119018694.

Adding to 400009124 its reverse (421900004), we get a palindrome (821909128).

The spelling of 400009124 in words is "four hundred million, nine thousand, one hundred twenty-four".