400188601 has 2 divisors, whose sum is σ = 400188602. Its totient is φ = 400188600.

The previous prime is 400188587. The next prime is 400188623. The reversal of 400188601 is 106881004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292444201 + 107744400 = 17101^2 + 10380^2 .

It is a cyclic number.

It is not a de Polignac number, because 400188601 - 2⁷ = 400188473 is a prime.

It is a super-3 number, since 3×400188601³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400188601.

It is not a weakly prime, because it can be changed into another prime (400188631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200094300 + 200094301.

It is an arithmetic number, because the mean of its divisors is an integer number (200094301).

Almost surely, 2^400188601 is an apocalyptic number.

It is an amenable number.

400188601 is a deficient number, since it is larger than the sum of its proper divisors (1).

400188601 is an equidigital number, since it uses as much as digits as its factorization.

400188601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 400188601 is about 20004.7144693445. The cubic root of 400188601 is about 736.9220835366.

The spelling of 400188601 in words is "four hundred million, one hundred eighty-eight thousand, six hundred one".