400020402 has 8 divisors (see below), whose sum is σ = 800040816. Its totient is φ = 133340132.

The previous prime is 400020391. The next prime is 400020407. The reversal of 400020402 is 204020004.

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

400020402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (400020407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33335028 + ... + 33335039.

It is an arithmetic number, because the mean of its divisors is an integer number (100005102).

Almost surely, 2^400020402 is an apocalyptic number.

400020402 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.

400020402 is a wasteful number, since it uses less digits than its factorization.

400020402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66670072.

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 400020402 is about 20000.5100434964. The cubic root of 400020402 is about 736.8188264502.

Adding to 400020402 its reverse (204020004), we get a palindrome (604040406).

The spelling of 400020402 in words is "four hundred million, twenty thousand, four hundred two".