400066739 has 2 divisors, whose sum is σ = 400066740. Its totient is φ = 400066738.

The previous prime is 400066697. The next prime is 400066741. The reversal of 400066739 is 937660004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400066739 - 2²⁴ = 383289523 is a prime.

Together with 400066741, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 400066699 and 400066708.

It is not a weakly prime, because it can be changed into another prime (400066769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200033369 + 200033370.

It is an arithmetic number, because the mean of its divisors is an integer number (200033370).

Almost surely, 2^400066739 is an apocalyptic number.

400066739 is a deficient number, since it is larger than the sum of its proper divisors (1).

400066739 is an equidigital number, since it uses as much as digits as its factorization.

400066739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 400066739 is about 20001.6684054106. The cubic root of 400066739 is about 736.8472755456.

The spelling of 400066739 in words is "four hundred million, sixty-six thousand, seven hundred thirty-nine".