400782623 has 2 divisors, whose sum is σ = 400782624. Its totient is φ = 400782622.

The previous prime is 400782559. The next prime is 400782643. The reversal of 400782623 is 326287004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400782623 - 2⁶ = 400782559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400782623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400782643) 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, 200391311 + 200391312.

It is an arithmetic number, because the mean of its divisors is an integer number (200391312).

Almost surely, 2^400782623 is an apocalyptic number.

400782623 is a deficient number, since it is larger than the sum of its proper divisors (1).

400782623 is an equidigital number, since it uses as much as digits as its factorization.

400782623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 400782623 is about 20019.5560140579. The cubic root of 400782623 is about 737.2865213010.

The spelling of 400782623 in words is "four hundred million, seven hundred eighty-two thousand, six hundred twenty-three".