400812019 has 4 divisors (see below), whose sum is σ = 401053840. Its totient is φ = 400570200.

The previous prime is 400812001. The next prime is 400812047. The reversal of 400812019 is 910218004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400812019 - 2¹¹ = 400809971 is a prime.

It is a super-2 number, since 2×400812019² = 321300549149712722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400811984 and 400812002.

It is not an unprimeable number, because it can be changed into a prime (400812089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118407 + ... + 121744.

It is an arithmetic number, because the mean of its divisors is an integer number (100263460).

Almost surely, 2^400812019 is an apocalyptic number.

400812019 is a deficient number, since it is larger than the sum of its proper divisors (241821).

400812019 is a wasteful number, since it uses less digits than its factorization.

400812019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241820.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 400812019 is about 20020.2901827121. The cubic root of 400812019 is about 737.3045466540.

The spelling of 400812019 in words is "four hundred million, eight hundred twelve thousand, nineteen".