400032001 has 4 divisors (see below), whose sum is σ = 400280404. Its totient is φ = 399783600.

The previous prime is 400031999. The next prime is 400032007. The reversal of 400032001 is 100230004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 256032001 + 144000000 = 16001^2 + 12000^2 .

It is a cyclic number.

It is not a de Polignac number, because 400032001 - 2¹ = 400031999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400032007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121770 + ... + 125011.

It is an arithmetic number, because the mean of its divisors is an integer number (100070101).

Almost surely, 2^400032001 is an apocalyptic number.

It is an amenable number.

400032001 is a deficient number, since it is larger than the sum of its proper divisors (248403).

400032001 is a wasteful number, since it uses less digits than its factorization.

400032001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248402.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 400032001 is about 20000.8000089996. The cubic root of 400032001 is about 736.8259479861.

Adding to 400032001 its reverse (100230004), we get a palindrome (500262005).

The spelling of 400032001 in words is "four hundred million, thirty-two thousand, one".