400426769 has 2 divisors, whose sum is σ = 400426770. Its totient is φ = 400426768.

The previous prime is 400426679. The next prime is 400426771. The reversal of 400426769 is 967624004.

Together with previous prime (400426679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273571600 + 126855169 = 16540^2 + 11263^2 .

It is a cyclic number.

It is not a de Polignac number, because 400426769 - 2⁸ = 400426513 is a prime.

It is a super-2 number, since 2×400426769² = 320683194663558722, which contains 22 as substring.

Together with 400426771, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400426069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200213384 + 200213385.

It is an arithmetic number, because the mean of its divisors is an integer number (200213385).

Almost surely, 2^400426769 is an apocalyptic number.

It is an amenable number.

400426769 is a deficient number, since it is larger than the sum of its proper divisors (1).

400426769 is an equidigital number, since it uses as much as digits as its factorization.

400426769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 400426769 is about 20010.6663807081. Note that the first 3 decimals coincide. The cubic root of 400426769 is about 737.0682449982.

The spelling of 400426769 in words is "four hundred million, four hundred twenty-six thousand, seven hundred sixty-nine".