400020004 has 6 divisors (see below), whose sum is σ = 700035014. Its totient is φ = 200010000.

The previous prime is 400019999. The next prime is 400020007.

400020004 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 399600100 + 419904 = 19990^2 + 648^2 .

It is not an unprimeable number, because it can be changed into a prime (400020007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50002497 + ... + 50002504.

Almost surely, 2^400020004 is an apocalyptic number.

It is an amenable number.

400020004 is a deficient number, since it is larger than the sum of its proper divisors (300015010).

400020004 is a wasteful number, since it uses less digits than its factorization.

400020004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100005005 (or 100005003 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 400020004 is about 20000.5000937477. The cubic root of 400020004 is about 736.8185820843.

The spelling of 400020004 in words is "four hundred million, twenty thousand, four".