400424405 has 8 divisors (see below), whose sum is σ = 480624000. Its totient is φ = 320263056.

The previous prime is 400424393. The next prime is 400424407. The reversal of 400424405 is 504424004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400424405 - 2⁸ = 400424149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400424407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24536 + ... + 37454.

It is an arithmetic number, because the mean of its divisors is an integer number (60078000).

Almost surely, 2^400424405 is an apocalyptic number.

It is an amenable number.

400424405 is a deficient number, since it is larger than the sum of its proper divisors (80199595).

400424405 is a wasteful number, since it uses less digits than its factorization.

400424405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19123.

The product of its (nonzero) digits is 2560, while the sum is 23.

The square root of 400424405 is about 20010.6073121232. The cubic root of 400424405 is about 737.0667945184.

Adding to 400424405 its reverse (504424004), we get a palindrome (904848409).

The spelling of 400424405 in words is "four hundred million, four hundred twenty-four thousand, four hundred five".