402240340 has 24 divisors (see below), whose sum is σ = 865309032. Its totient is φ = 156971520.

The previous prime is 402240269. The next prime is 402240341. The reversal of 402240340 is 43042204.

It can be written as a sum of positive squares in 4 ways, for example, as 52475536 + 349764804 = 7244^2 + 18702^2 .

It is a super-2 number, since 2×402240340² = 323594582246631200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402240341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244449 + ... + 246088.

It is an arithmetic number, because the mean of its divisors is an integer number (36054543).

Almost surely, 2^402240340 is an apocalyptic number.

It is an amenable number.

402240340 is an abundant number, since it is smaller than the sum of its proper divisors (463068692).

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

402240340 is a wasteful number, since it uses less digits than its factorization.

402240340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490587 (or 490585 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 402240340 is about 20055.9302950524. The cubic root of 402240340 is about 738.1793200706.

Adding to 402240340 its reverse (43042204), we get a palindrome (445282544).

The spelling of 402240340 in words is "four hundred two million, two hundred forty thousand, three hundred forty".