402444284 has 12 divisors (see below), whose sum is σ = 768302808. Its totient is φ = 182929200.

The previous prime is 402444283. The next prime is 402444293. The reversal of 402444284 is 482444204.

It is a super-2 number, since 2×402444284² = 323922803448545312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 402444284.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402444283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4573187 + ... + 4573274.

It is an arithmetic number, because the mean of its divisors is an integer number (64025234).

Almost surely, 2^402444284 is an apocalyptic number.

402444284 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

402444284 is a deficient number, since it is larger than the sum of its proper divisors (365858524).

402444284 is a wasteful number, since it uses less digits than its factorization.

402444284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9146476 (or 9146474 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 32.

The square root of 402444284 is about 20061.0140321969. The cubic root of 402444284 is about 738.3040562809.

Adding to 402444284 its reverse (482444204), we get a palindrome (884888488).

The spelling of 402444284 in words is "four hundred two million, four hundred forty-four thousand, two hundred eighty-four".