400897243 has 2 divisors, whose sum is σ = 400897244. Its totient is φ = 400897242.

The previous prime is 400897201. The next prime is 400897279. The reversal of 400897243 is 342798004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400897243 - 2⁹ = 400896731 is a prime.

It is a super-4 number, since 4×400897243⁴ (a number of 36 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (400891243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200448621 + 200448622.

It is an arithmetic number, because the mean of its divisors is an integer number (200448622).

Almost surely, 2^400897243 is an apocalyptic number.

400897243 is a deficient number, since it is larger than the sum of its proper divisors (1).

400897243 is an equidigital number, since it uses as much as digits as its factorization.

400897243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 400897243 is about 20022.4185102599. The cubic root of 400897243 is about 737.3568002347.

The spelling of 400897243 in words is "four hundred million, eight hundred ninety-seven thousand, two hundred forty-three".