402040420 has 24 divisors (see below), whose sum is σ = 844873848. Its totient is φ = 160704000.

The previous prime is 402040417. The next prime is 402040421. The reversal of 402040420 is 24040204.

It can be written as a sum of positive squares in 4 ways, for example, as 61121124 + 340919296 = 7818^2 + 18464^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402040394 and 402040403.

It is not an unprimeable number, because it can be changed into a prime (402040421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26220 + ... + 38620.

It is an arithmetic number, because the mean of its divisors is an integer number (35203077).

Almost surely, 2^402040420 is an apocalyptic number.

It is an amenable number.

402040420 is an abundant number, since it is smaller than the sum of its proper divisors (442833428).

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

402040420 is a wasteful number, since it uses less digits than its factorization.

402040420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14031 (or 14029 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 402040420 is about 20050.9456136113. The cubic root of 402040420 is about 738.0570040892.

Adding to 402040420 its reverse (24040204), we get a palindrome (426080624).

The spelling of 402040420 in words is "four hundred two million, forty thousand, four hundred twenty".