402044240 has 120 divisors (see below), whose sum is σ = 1024407648. Its totient is φ = 146664960.

The previous prime is 402044219. The next prime is 402044243. The reversal of 402044240 is 42440204.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402044243) 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 23 ways as a sum of consecutive naturals, for example, 1771007 + ... + 1771233.

Almost surely, 2^402044240 is an apocalyptic number.

402044240 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 402044240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512203824).

402044240 is an abundant number, since it is smaller than the sum of its proper divisors (622363408).

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

402044240 is a wasteful number, since it uses less digits than its factorization.

402044240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 402044240 is about 20051.0408707379. The cubic root of 402044240 is about 738.0593416393.

Adding to 402044240 its reverse (42440204), we get a palindrome (444484444).

It can be divided in two parts, 40204 and 4240, that added together give a palindrome (44444).

The spelling of 402044240 in words is "four hundred two million, forty-four thousand, two hundred forty".