400725823 has 2 divisors, whose sum is σ = 400725824. Its totient is φ = 400725822.

The previous prime is 400725797. The next prime is 400725833. The reversal of 400725823 is 328527004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400725823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400725833) 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, 200362911 + 200362912.

It is an arithmetic number, because the mean of its divisors is an integer number (200362912).

Almost surely, 2^400725823 is an apocalyptic number.

400725823 is a deficient number, since it is larger than the sum of its proper divisors (1).

400725823 is an equidigital number, since it uses as much as digits as its factorization.

400725823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 400725823 is about 20018.1373509125. The cubic root of 400725823 is about 737.2516895739.

The spelling of 400725823 in words is "four hundred million, seven hundred twenty-five thousand, eight hundred twenty-three".