400354489 has 2 divisors, whose sum is σ = 400354490. Its totient is φ = 400354488.

The previous prime is 400354481. The next prime is 400354519. The reversal of 400354489 is 984453004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359292025 + 41062464 = 18955^2 + 6408^2 .

It is a cyclic number.

It is not a de Polignac number, because 400354489 - 2³ = 400354481 is a prime.

It is a super-2 number, since 2×400354489² = 320567433724902242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400354481) 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 as a sum of consecutive naturals, namely, 200177244 + 200177245.

It is an arithmetic number, because the mean of its divisors is an integer number (200177245).

Almost surely, 2^400354489 is an apocalyptic number.

It is an amenable number.

400354489 is a deficient number, since it is larger than the sum of its proper divisors (1).

400354489 is an equidigital number, since it uses as much as digits as its factorization.

400354489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 400354489 is about 20008.8602623938. The cubic root of 400354489 is about 737.0238935689.

The spelling of 400354489 in words is "four hundred million, three hundred fifty-four thousand, four hundred eighty-nine".