400158691 has 2 divisors, whose sum is σ = 400158692. Its totient is φ = 400158690.

The previous prime is 400158679. The next prime is 400158727. The reversal of 400158691 is 196851004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400158691 - 2¹¹ = 400156643 is a prime.

It is not a weakly prime, because it can be changed into another prime (400158191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200079345 + 200079346.

It is an arithmetic number, because the mean of its divisors is an integer number (200079346).

Almost surely, 2^400158691 is an apocalyptic number.

400158691 is a deficient number, since it is larger than the sum of its proper divisors (1).

400158691 is an equidigital number, since it uses as much as digits as its factorization.

400158691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 400158691 is about 20003.9668815963. The cubic root of 400158691 is about 736.9037239527.

The spelling of 400158691 in words is "four hundred million, one hundred fifty-eight thousand, six hundred ninety-one".