400015421 has 8 divisors (see below), whose sum is σ = 431047680. Its totient is φ = 369020592.

The previous prime is 400015403. The next prime is 400015453. The reversal of 400015421 is 124510004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400015421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400015421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400015921) 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 7 ways as a sum of consecutive naturals, for example, 15260 + ... + 32138.

It is an arithmetic number, because the mean of its divisors is an integer number (53880960).

Almost surely, 2^400015421 is an apocalyptic number.

It is an amenable number.

400015421 is a deficient number, since it is larger than the sum of its proper divisors (31032259).

400015421 is a wasteful number, since it uses less digits than its factorization.

400015421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18715.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 400015421 is about 20000.3855212843. The cubic root of 400015421 is about 736.8157681814.

Adding to 400015421 its reverse (124510004), we get a palindrome (524525425).

The spelling of 400015421 in words is "four hundred million, fifteen thousand, four hundred twenty-one".