402213240 has 288 divisors, whose sum is σ = 1546730640. Its totient is φ = 89856000.

The previous prime is 402213233. The next prime is 402213277. The reversal of 402213240 is 42312204.

402213240 is a `hidden beast` number, since 402 + 21 + 3 + 240 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 668940 + ... + 669540.

Almost surely, 2^402213240 is an apocalyptic number.

402213240 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 402213240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773365320).

402213240 is an abundant number, since it is smaller than the sum of its proper divisors (1144517400).

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

402213240 is a wasteful number, since it uses less digits than its factorization.

402213240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 402213240 is about 20055.2546730277. The cubic root of 402213240 is about 738.1627419978.

Adding to 402213240 its reverse (42312204), we get a palindrome (444525444).

The spelling of 402213240 in words is "four hundred two million, two hundred thirteen thousand, two hundred forty".