400402545 has 32 divisors (see below), whose sum is σ = 660182400. Its totient is φ = 207128064.

The previous prime is 400402543. The next prime is 400402549. The reversal of 400402545 is 545204004.

It is not a de Polignac number, because 400402545 - 2¹ = 400402543 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400402543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67926 + ... + 73584.

It is an arithmetic number, because the mean of its divisors is an integer number (20630700).

Almost surely, 2^400402545 is an apocalyptic number.

It is an amenable number.

400402545 is a deficient number, since it is larger than the sum of its proper divisors (259779855).

400402545 is a wasteful number, since it uses less digits than its factorization.

400402545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809.

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

The square root of 400402545 is about 20010.0610943595. The cubic root of 400402545 is about 737.0533816052.

Adding to 400402545 its reverse (545204004), we get a palindrome (945606549).

The spelling of 400402545 in words is "four hundred million, four hundred two thousand, five hundred forty-five".