400767643 has 2 divisors, whose sum is σ = 400767644. Its totient is φ = 400767642.

The previous prime is 400767613. The next prime is 400767691. The reversal of 400767643 is 346767004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400767643 - 2⁹ = 400767131 is a prime.

It is a super-2 number, since 2×400767643² = 321229407351550898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400767613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200383821 + 200383822.

It is an arithmetic number, because the mean of its divisors is an integer number (200383822).

Almost surely, 2^400767643 is an apocalyptic number.

400767643 is a deficient number, since it is larger than the sum of its proper divisors (1).

400767643 is an equidigital number, since it uses as much as digits as its factorization.

400767643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 400767643 is about 20019.1818763905. The cubic root of 400767643 is about 737.2773353657.

The spelling of 400767643 in words is "four hundred million, seven hundred sixty-seven thousand, six hundred forty-three".