402297840 has 400 divisors, whose sum is σ = 1638436800. Its totient is φ = 91445760.

The previous prime is 402297829. The next prime is 402297871. The reversal of 402297840 is 48792204.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 402297795 and 402297804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2222550 + ... + 2222730.

It is an arithmetic number, because the mean of its divisors is an integer number (4096092).

Almost surely, 2^402297840 is an apocalyptic number.

402297840 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 402297840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819218400).

402297840 is an abundant number, since it is smaller than the sum of its proper divisors (1236138960).

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

402297840 is a wasteful number, since it uses less digits than its factorization.

402297840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 402297840 is about 20057.3637350475. The cubic root of 402297840 is about 738.2144924823.

The spelling of 402297840 in words is "four hundred two million, two hundred ninety-seven thousand, eight hundred forty".