400042401 has 8 divisors (see below), whose sum is σ = 581879904. Its totient is φ = 242449920.

The previous prime is 400042369. The next prime is 400042441. The reversal of 400042401 is 104240004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400042401 - 2⁵ = 400042369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400042441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6061216 + ... + 6061281.

It is an arithmetic number, because the mean of its divisors is an integer number (72734988).

Almost surely, 2^400042401 is an apocalyptic number.

It is an amenable number.

400042401 is a deficient number, since it is larger than the sum of its proper divisors (181837503).

400042401 is a wasteful number, since it uses less digits than its factorization.

400042401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12122511.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 400042401 is about 20001.0599969102. The cubic root of 400042401 is about 736.8323332448.

Adding to 400042401 its reverse (104240004), we get a palindrome (504282405).

The spelling of 400042401 in words is "four hundred million, forty-two thousand, four hundred one".