402140064 has 48 divisors (see below), whose sum is σ = 1070096832. Its totient is φ = 132208128.

The previous prime is 402140051. The next prime is 402140069. The reversal of 402140064 is 460041204.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 402140064.

It is not an unprimeable number, because it can be changed into a prime (402140069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21684 + ... + 35699.

It is an arithmetic number, because the mean of its divisors is an integer number (22293684).

Almost surely, 2^402140064 is an apocalyptic number.

It is an amenable number.

402140064 is an abundant number, since it is smaller than the sum of its proper divisors (667956768).

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

402140064 is a wasteful number, since it uses less digits than its factorization.

402140064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57469 (or 57461 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 402140064 is about 20053.4302302624. The cubic root of 402140064 is about 738.1179738106.

Adding to 402140064 its reverse (460041204), we get a palindrome (862181268).

The spelling of 402140064 in words is "four hundred two million, one hundred forty thousand, sixty-four".