400000002 has 8 divisors (see below), whose sum is σ = 800000016. Its totient is φ = 133333332.

The previous prime is 399999959. The next prime is 400000009. The reversal of 400000002 is 200000004.

It is a sphenic number, since it is the product of 3 distinct primes.

400000002 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (6), and also a Moran number because the ratio is a prime number: 66666667 = 400000002 / (4 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (400000009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33333328 + ... + 33333339.

It is an arithmetic number, because the mean of its divisors is an integer number (100000002).

Almost surely, 2^400000002 is an apocalyptic number.

400000002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400000002 is a wasteful number, since it uses less digits than its factorization.

400000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66666672.

The product of its (nonzero) digits is 8, while the sum is 6.

The square root of 400000002 is about 20000.0000500000. Note that the first 4 decimals coincide. The cubic root of 400000002 is about 736.8063009561.

Adding to 400000002 its reverse (200000004), we get a palindrome (600000006).

The spelling of 400000002 in words is "four hundred million, two", and thus it is an aban number.