400206019 has 2 divisors, whose sum is σ = 400206020. Its totient is φ = 400206018.

The previous prime is 400206013. The next prime is 400206067. The reversal of 400206019 is 910602004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400206019 - 2¹¹ = 400203971 is a prime.

It is a super-2 number, since 2×400206019² = 320329715287656722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400206013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200103009 + 200103010.

It is an arithmetic number, because the mean of its divisors is an integer number (200103010).

Almost surely, 2^400206019 is an apocalyptic number.

400206019 is a deficient number, since it is larger than the sum of its proper divisors (1).

400206019 is an equidigital number, since it uses as much as digits as its factorization.

400206019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 400206019 is about 20005.1498119859. The cubic root of 400206019 is about 736.9327747646.

The spelling of 400206019 in words is "four hundred million, two hundred six thousand, nineteen".