400003679 has 2 divisors, whose sum is σ = 400003680. Its totient is φ = 400003678.

The previous prime is 400003663. The next prime is 400003687. The reversal of 400003679 is 976300004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400003679 - 2⁴ = 400003663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400003619) 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, 200001839 + 200001840.

It is an arithmetic number, because the mean of its divisors is an integer number (200001840).

Almost surely, 2^400003679 is an apocalyptic number.

400003679 is a deficient number, since it is larger than the sum of its proper divisors (1).

400003679 is an equidigital number, since it uses as much as digits as its factorization.

400003679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 400003679 is about 20000.0919747885. The cubic root of 400003679 is about 736.8085586465.

The spelling of 400003679 in words is "four hundred million, three thousand, six hundred seventy-nine".