400045421 has 4 divisors (see below), whose sum is σ = 412950144. Its totient is φ = 387140700.

The previous prime is 400045403. The next prime is 400045423. The reversal of 400045421 is 124540004.

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 400045421 - 2¹⁰ = 400044397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400045393 and 400045402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400045423) 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 3 ways as a sum of consecutive naturals, for example, 6452315 + ... + 6452376.

It is an arithmetic number, because the mean of its divisors is an integer number (103237536).

Almost surely, 2^400045421 is an apocalyptic number.

It is an amenable number.

400045421 is a deficient number, since it is larger than the sum of its proper divisors (12904723).

400045421 is a wasteful number, since it uses less digits than its factorization.

400045421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12904722.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 400045421 is about 20001.1354927664. The cubic root of 400045421 is about 736.8341874050.

Adding to 400045421 its reverse (124540004), we get a palindrome (524585425).

The spelling of 400045421 in words is "four hundred million, forty-five thousand, four hundred twenty-one".