400402243 has 4 divisors (see below), whose sum is σ = 400859680. Its totient is φ = 399944808.

The previous prime is 400402213. The next prime is 400402273. The reversal of 400402243 is 342204004.

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

It is an interprime number because it is at equal distance from previous prime (400402213) and next prime (400402273).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400402243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400402243.

It is not an unprimeable number, because it can be changed into a prime (400402213) 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, 227403 + ... + 229156.

It is an arithmetic number, because the mean of its divisors is an integer number (100214920).

Almost surely, 2^400402243 is an apocalyptic number.

400402243 is a deficient number, since it is larger than the sum of its proper divisors (457437).

400402243 is an equidigital number, since it uses as much as digits as its factorization.

400402243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457436.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 400402243 is about 20010.0535481542. The cubic root of 400402243 is about 737.0531962999.

Adding to 400402243 its reverse (342204004), we get a palindrome (742606247).

The spelling of 400402243 in words is "four hundred million, four hundred two thousand, two hundred forty-three".