400158191 has 2 divisors, whose sum is σ = 400158192. Its totient is φ = 400158190.

The previous prime is 400158173. The next prime is 400158197. The reversal of 400158191 is 191851004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400158191 - 2⁶ = 400158127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400158197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200079095 + 200079096.

It is an arithmetic number, because the mean of its divisors is an integer number (200079096).

Almost surely, 2^400158191 is an apocalyptic number.

400158191 is a deficient number, since it is larger than the sum of its proper divisors (1).

400158191 is an equidigital number, since it uses as much as digits as its factorization.

400158191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 400158191 is about 20003.9543840712. The cubic root of 400158191 is about 736.9034170311.

The spelling of 400158191 in words is "four hundred million, one hundred fifty-eight thousand, one hundred ninety-one".