400134645 has 12 divisors (see below), whose sum is σ = 693566796. Its totient is φ = 213405120.

The previous prime is 400134643. The next prime is 400134649. The reversal of 400134645 is 546431004.

400134645 is a `hidden beast` number, since 4 + 0 + 0 + 13 + 4 + 645 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 204861969 + 195272676 = 14313^2 + 13974^2 .

It is not a de Polignac number, because 400134645 - 2¹ = 400134643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400134643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4445896 + ... + 4445985.

It is an arithmetic number, because the mean of its divisors is an integer number (57797233).

Almost surely, 2^400134645 is an apocalyptic number.

400134645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400134645 is a deficient number, since it is larger than the sum of its proper divisors (293432151).

400134645 is a wasteful number, since it uses less digits than its factorization.

400134645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8891892 (or 8891889 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 400134645 is about 20003.3658417777. The cubic root of 400134645 is about 736.8889631904. Note that the first 3 decimals are identical.

Adding to 400134645 its reverse (546431004), we get a palindrome (946565649).

The spelling of 400134645 in words is "four hundred million, one hundred thirty-four thousand, six hundred forty-five".