400202001 has 48 divisors (see below), whose sum is σ = 629366400. Its totient is φ = 244290816.

The previous prime is 400201979. The next prime is 400202017. The reversal of 400202001 is 100202004.

It is not a de Polignac number, because 400202001 - 2⁵ = 400201969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (400202021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 978285 + ... + 978693.

It is an arithmetic number, because the mean of its divisors is an integer number (13111800).

Almost surely, 2^400202001 is an apocalyptic number.

It is an amenable number.

400202001 is a deficient number, since it is larger than the sum of its proper divisors (229164399).

400202001 is a wasteful number, since it uses less digits than its factorization.

400202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 400202001 is about 20005.0493875921. The cubic root of 400202001 is about 736.9303085300.

Adding to 400202001 its reverse (100202004), we get a palindrome (500404005).

The spelling of 400202001 in words is "four hundred million, two hundred two thousand, one".