402440140 has 96 divisors (see below), whose sum is σ = 928972800. Its totient is φ = 145877760.

The previous prime is 402440113. The next prime is 402440147. The reversal of 402440140 is 41044204.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (402440147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1495926 + ... + 1496194.

It is an arithmetic number, because the mean of its divisors is an integer number (9676800).

Almost surely, 2^402440140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402440140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464486400).

402440140 is an abundant number, since it is smaller than the sum of its proper divisors (526532660).

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

402440140 is a wasteful number, since it uses less digits than its factorization.

402440140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 402440140 is about 20060.9107470224. The cubic root of 402440140 is about 738.3015221475.

Adding to 402440140 its reverse (41044204), we get a palindrome (443484344).

The spelling of 402440140 in words is "four hundred two million, four hundred forty thousand, one hundred forty".