400134001 has 4 divisors (see below), whose sum is σ = 401058532. Its totient is φ = 399209472.

The previous prime is 400133999. The next prime is 400134011. The reversal of 400134001 is 100431004.

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 257570401 + 142563600 = 16049^2 + 11940^2 .

It is a cyclic number.

It is not a de Polignac number, because 400134001 - 2¹ = 400133999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400134011) 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, 461616 + ... + 462481.

It is an arithmetic number, because the mean of its divisors is an integer number (100264633).

Almost surely, 2^400134001 is an apocalyptic number.

It is an amenable number.

400134001 is a deficient number, since it is larger than the sum of its proper divisors (924531).

400134001 is an equidigital number, since it uses as much as digits as its factorization.

400134001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924530.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400134001 is about 20003.3497444803. The cubic root of 400134001 is about 736.8885678596. Note that the first 3 decimals are identical.

Adding to 400134001 its reverse (100431004), we get a palindrome (500565005).

The spelling of 400134001 in words is "four hundred million, one hundred thirty-four thousand, one".