400341621 has 4 divisors (see below), whose sum is σ = 533788832. Its totient is φ = 266894412.

The previous prime is 400341593. The next prime is 400341649. The reversal of 400341621 is 126143004.

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 an interprime number because it is at equal distance from previous prime (400341593) and next prime (400341649).

It is a de Polignac number, because none of the positive numbers 2^k-400341621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400343621) 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, 66723601 + ... + 66723606.

It is an arithmetic number, because the mean of its divisors is an integer number (133447208).

Almost surely, 2^400341621 is an apocalyptic number.

It is an amenable number.

400341621 is a deficient number, since it is larger than the sum of its proper divisors (133447211).

400341621 is a wasteful number, since it uses less digits than its factorization.

400341621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133447210.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 400341621 is about 20008.5387022641. The cubic root of 400341621 is about 737.0159971293.

Adding to 400341621 its reverse (126143004), we get a palindrome (526484625).

The spelling of 400341621 in words is "four hundred million, three hundred forty-one thousand, six hundred twenty-one".