400866803 has 2 divisors, whose sum is σ = 400866804. Its totient is φ = 400866802.

The previous prime is 400866779. The next prime is 400866811. The reversal of 400866803 is 308668004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400866803 - 2¹⁴ = 400850419 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400866853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200433401 + 200433402.

It is an arithmetic number, because the mean of its divisors is an integer number (200433402).

Almost surely, 2^400866803 is an apocalyptic number.

400866803 is a deficient number, since it is larger than the sum of its proper divisors (1).

400866803 is an equidigital number, since it uses as much as digits as its factorization.

400866803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 400866803 is about 20021.6583478992. The cubic root of 400866803 is about 737.3381373400.

The spelling of 400866803 in words is "four hundred million, eight hundred sixty-six thousand, eight hundred three".