401686783 has 2 divisors, whose sum is σ = 401686784. Its totient is φ = 401686782.

The previous prime is 401686729. The next prime is 401686793. The reversal of 401686783 is 387686104.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401686783 is a prime.

It is a super-2 number, since 2×401686783² = 322704543273778178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401686723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200843391 + 200843392.

It is an arithmetic number, because the mean of its divisors is an integer number (200843392).

Almost surely, 2^401686783 is an apocalyptic number.

401686783 is a deficient number, since it is larger than the sum of its proper divisors (1).

401686783 is an equidigital number, since it uses as much as digits as its factorization.

401686783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 401686783 is about 20042.1252116636. The cubic root of 401686783 is about 737.8405409211.

The spelling of 401686783 in words is "four hundred one million, six hundred eighty-six thousand, seven hundred eighty-three".