402240040 has 16 divisors (see below), whose sum is σ = 905040180. Its totient is φ = 160896000.

The previous prime is 402240037. The next prime is 402240049. The reversal of 402240040 is 40042204.

It can be written as a sum of positive squares in 2 ways, for example, as 400880484 + 1359556 = 20022^2 + 1166^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402239996 and 402240023.

It is not an unprimeable number, because it can be changed into a prime (402240049) 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, 5027961 + ... + 5028040.

Almost surely, 2^402240040 is an apocalyptic number.

402240040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402240040 is an abundant number, since it is smaller than the sum of its proper divisors (502800140).

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

402240040 is a wasteful number, since it uses less digits than its factorization.

402240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10056012 (or 10056008 counting only the distinct ones).

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

The square root of 402240040 is about 20055.9228159664. The cubic root of 402240040 is about 738.1791365535.

Adding to 402240040 its reverse (40042204), we get a palindrome (442282244).

The spelling of 402240040 in words is "four hundred two million, two hundred forty thousand, forty".