400074643 has 4 divisors (see below), whose sum is σ = 400625680. Its totient is φ = 399523608.

The previous prime is 400074641. The next prime is 400074667. The reversal of 400074643 is 346470004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400074643 - 2¹ = 400074641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400074641) 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, 274428 + ... + 275881.

It is an arithmetic number, because the mean of its divisors is an integer number (100156420).

Almost surely, 2^400074643 is an apocalyptic number.

400074643 is a deficient number, since it is larger than the sum of its proper divisors (551037).

400074643 is an equidigital number, since it uses as much as digits as its factorization.

400074643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551036.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 400074643 is about 20001.8659879522. The cubic root of 400074643 is about 736.8521280714.

The spelling of 400074643 in words is "four hundred million, seventy-four thousand, six hundred forty-three".