402040240 has 80 divisors (see below), whose sum is σ = 1102786560. Its totient is φ = 133390080.

The previous prime is 402040237. The next prime is 402040241. The reversal of 402040240 is 42040204.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (402040241) 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 15 ways as a sum of consecutive naturals, for example, 5781 + ... + 28939.

It is an arithmetic number, because the mean of its divisors is an integer number (13784832).

Almost surely, 2^402040240 is an apocalyptic number.

402040240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402040240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (551393280).

402040240 is an abundant number, since it is smaller than the sum of its proper divisors (700746320).

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

402040240 is a wasteful number, since it uses less digits than its factorization.

402040240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23210 (or 23204 counting only the distinct ones).

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

The square root of 402040240 is about 20050.9411250445. The cubic root of 402040240 is about 738.0568939425.

Adding to 402040240 its reverse (42040204), we get a palindrome (444080444).

The spelling of 402040240 in words is "four hundred two million, forty thousand, two hundred forty".