400420545 has 32 divisors (see below), whose sum is σ = 757451520. Its totient is φ = 176736000.

The previous prime is 400420543. The next prime is 400420561. The reversal of 400420545 is 545024004.

It is not a de Polignac number, because 400420545 - 2¹ = 400420543 is a prime.

It is a super-2 number, since 2×400420545² = 320673225716194050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400420543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62706 + ... + 68795.

It is an arithmetic number, because the mean of its divisors is an integer number (23670360).

Almost surely, 2^400420545 is an apocalyptic number.

It is an amenable number.

400420545 is a deficient number, since it is larger than the sum of its proper divisors (357030975).

400420545 is a wasteful number, since it uses less digits than its factorization.

400420545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131545.

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 400420545 is about 20010.5108630440. The cubic root of 400420545 is about 737.0644261255.

Adding to 400420545 its reverse (545024004), we get a palindrome (945444549).

The spelling of 400420545 in words is "four hundred million, four hundred twenty thousand, five hundred forty-five".