401335645 has 4 divisors (see below), whose sum is σ = 481602780. Its totient is φ = 321068512.

The previous prime is 401335619. The next prime is 401335681. The reversal of 401335645 is 546533104.

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 174953529 + 226382116 = 13227^2 + 15046^2 .

It is a cyclic number.

It is not a de Polignac number, because 401335645 - 2¹³ = 401327453 is a prime.

It is a super-2 number, since 2×401335645² = 322140599895132050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40133560 + ... + 40133569.

It is an arithmetic number, because the mean of its divisors is an integer number (120400695).

Almost surely, 2^401335645 is an apocalyptic number.

It is an amenable number.

401335645 is a deficient number, since it is larger than the sum of its proper divisors (80267135).

401335645 is an equidigital number, since it uses as much as digits as its factorization.

401335645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80267134.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 401335645 is about 20033.3632972599. The cubic root of 401335645 is about 737.6254816651.

Adding to 401335645 its reverse (546533104), we get a palindrome (947868749).

The spelling of 401335645 in words is "four hundred one million, three hundred thirty-five thousand, six hundred forty-five".