400425405 has 16 divisors (see below), whose sum is σ = 641322240. Its totient is φ = 213346368.

The previous prime is 400425401. The next prime is 400425407. The reversal of 400425405 is 504524004.

It is not a de Polignac number, because 400425405 - 2² = 400425401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400425401) 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 15 ways as a sum of consecutive naturals, for example, 2739 + ... + 28431.

It is an arithmetic number, because the mean of its divisors is an integer number (40082640).

Almost surely, 2^400425405 is an apocalyptic number.

It is an amenable number.

400425405 is a deficient number, since it is larger than the sum of its proper divisors (240896835).

400425405 is a wasteful number, since it uses less digits than its factorization.

400425405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26740.

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

The square root of 400425405 is about 20010.6322988555. The cubic root of 400425405 is about 737.0674080892.

Adding to 400425405 its reverse (504524004), we get a palindrome (904949409).

The spelling of 400425405 in words is "four hundred million, four hundred twenty-five thousand, four hundred five".