400343641 has 4 divisors (see below), whose sum is σ = 413257984. Its totient is φ = 387429300.

The previous prime is 400343621. The next prime is 400343651. The reversal of 400343641 is 146343004.

It is a happy number.

400343641 is nontrivially palindromic in base 5.

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 400343641 - 2⁷ = 400343513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400343621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6457125 + ... + 6457186.

It is an arithmetic number, because the mean of its divisors is an integer number (103314496).

Almost surely, 2^400343641 is an apocalyptic number.

It is an amenable number.

400343641 is a deficient number, since it is larger than the sum of its proper divisors (12914343).

400343641 is a wasteful number, since it uses less digits than its factorization.

400343641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12914342.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 400343641 is about 20008.5891806494. The cubic root of 400343641 is about 737.0172367121.

Adding to 400343641 its reverse (146343004), we get a palindrome (546686645).

The spelling of 400343641 in words is "four hundred million, three hundred forty-three thousand, six hundred forty-one".