400145401 has 4 divisors (see below), whose sum is σ = 409451152. Its totient is φ = 390839652.

The previous prime is 400145399. The next prime is 400145411. The reversal of 400145401 is 104541004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400145401 - 2¹ = 400145399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400145411) 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, 4652811 + ... + 4652896.

It is an arithmetic number, because the mean of its divisors is an integer number (102362788).

Almost surely, 2^400145401 is an apocalyptic number.

It is an amenable number.

400145401 is a deficient number, since it is larger than the sum of its proper divisors (9305751).

400145401 is an equidigital number, since it uses as much as digits as its factorization.

400145401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9305750.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 400145401 is about 20003.6346947249. The cubic root of 400145401 is about 736.8955658901.

Adding to 400145401 its reverse (104541004), we get a palindrome (504686405).

The spelling of 400145401 in words is "four hundred million, one hundred forty-five thousand, four hundred one".