400243997 has 8 divisors (see below), whose sum is σ = 412881312. Its totient is φ = 387802800.

The previous prime is 400243981. The next prime is 400244021. The reversal of 400243997 is 799342004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400243997 - 2⁴ = 400243981 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 400243997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400245997) 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 7 ways as a sum of consecutive naturals, for example, 44879 + ... + 53052.

It is an arithmetic number, because the mean of its divisors is an integer number (51610164).

Almost surely, 2^400243997 is an apocalyptic number.

It is an amenable number.

400243997 is a deficient number, since it is larger than the sum of its proper divisors (12637315).

400243997 is an equidigital number, since it uses as much as digits as its factorization.

400243997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98059.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 400243997 is about 20006.0989950565. The cubic root of 400243997 is about 736.9560847152.

The spelling of 400243997 in words is "four hundred million, two hundred forty-three thousand, nine hundred ninety-seven".