400013421 has 4 divisors (see below), whose sum is σ = 533351232. Its totient is φ = 266675612.

The previous prime is 400013413. The next prime is 400013423. The reversal of 400013421 is 124310004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400013421 - 2³ = 400013413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400013421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400013423) 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 3 ways as a sum of consecutive naturals, for example, 66668901 + ... + 66668906.

It is an arithmetic number, because the mean of its divisors is an integer number (133337808).

Almost surely, 2^400013421 is an apocalyptic number.

It is an amenable number.

400013421 is a deficient number, since it is larger than the sum of its proper divisors (133337811).

400013421 is a wasteful number, since it uses less digits than its factorization.

400013421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133337810.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 400013421 is about 20000.3355221856. The cubic root of 400013421 is about 736.8145402004.

Adding to 400013421 its reverse (124310004), we get a palindrome (524323425).

The spelling of 400013421 in words is "four hundred million, thirteen thousand, four hundred twenty-one".