400504789 has 2 divisors, whose sum is σ = 400504790. Its totient is φ = 400504788.

The previous prime is 400504777. The next prime is 400504801. The reversal of 400504789 is 987405004.

It is a balanced prime because it is at equal distance from previous prime (400504777) and next prime (400504801).

It can be written as a sum of positive squares in only one way, i.e., 332442289 + 68062500 = 18233^2 + 8250^2 .

It is a cyclic number.

It is not a de Polignac number, because 400504789 - 2¹³ = 400496597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400504739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200252394 + 200252395.

It is an arithmetic number, because the mean of its divisors is an integer number (200252395).

Almost surely, 2^400504789 is an apocalyptic number.

It is an amenable number.

400504789 is a deficient number, since it is larger than the sum of its proper divisors (1).

400504789 is an equidigital number, since it uses as much as digits as its factorization.

400504789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 400504789 is about 20012.6157460738. The cubic root of 400504789 is about 737.1161125355.

The spelling of 400504789 in words is "four hundred million, five hundred four thousand, seven hundred eighty-nine".