400000401 has 6 divisors (see below), whose sum is σ = 577778370. Its totient is φ = 266666928.

The previous prime is 400000373. The next prime is 400000411. The reversal of 400000401 is 104000004.

It can be written as a sum of positive squares in only one way, i.e., 391090176 + 8910225 = 19776^2 + 2985^2 .

It is not a de Polignac number, because 400000401 - 2¹⁰ = 399999377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 44444489 = 400000401 / (4 + 0 + 0 + 0 + 0 + 0 + 4 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (400000411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22222236 + ... + 22222253.

It is an arithmetic number, because the mean of its divisors is an integer number (96296395).

Almost surely, 2^400000401 is an apocalyptic number.

It is an amenable number.

400000401 is a deficient number, since it is larger than the sum of its proper divisors (177777969).

400000401 is a wasteful number, since it uses less digits than its factorization.

400000401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44444495 (or 44444492 counting only the distinct ones).

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

The square root of 400000401 is about 20000.0100249975. The cubic root of 400000401 is about 736.8065459441.

Adding to 400000401 its reverse (104000004), we get a palindrome (504000405).

The spelling of 400000401 in words is "four hundred million, four hundred one", and thus it is an aban number.