400154281 has 2 divisors, whose sum is σ = 400154282. Its totient is φ = 400154280.

The previous prime is 400154233. The next prime is 400154317. The reversal of 400154281 is 182451004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393824025 + 6330256 = 19845^2 + 2516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400154281 is a prime.

It is a super-2 number, since 2×400154281² = 320246897205253922, which contains 22 as substring.

It is equal to p_21344074 and since 400154281 and 21344074 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (400154201) 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, 200077140 + 200077141.

It is an arithmetic number, because the mean of its divisors is an integer number (200077141).

Almost surely, 2^400154281 is an apocalyptic number.

It is an amenable number.

400154281 is a deficient number, since it is larger than the sum of its proper divisors (1).

400154281 is an equidigital number, since it uses as much as digits as its factorization.

400154281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 400154281 is about 20003.8566531557. The cubic root of 400154281 is about 736.9010168955.

The spelling of 400154281 in words is "four hundred million, one hundred fifty-four thousand, two hundred eighty-one".