168440490 has 24 divisors (see below), whose sum is σ = 437945508. Its totient is φ = 44917440.

The previous prime is 168440473. The next prime is 168440507. The reversal of 168440490 is 94044861.

It is a happy number.

168440490 is a `hidden beast` number, since 168 + 4 + 4 + 0 + 490 = 666.

It is an interprime number because it is at equal distance from previous prime (168440473) and next prime (168440507).

It can be written as a sum of positive squares in 2 ways, for example, as 164788569 + 3651921 = 12837^2 + 1911^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 935691 + ... + 935870.

Almost surely, 2^168440490 is an apocalyptic number.

168440490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168440490 is an abundant number, since it is smaller than the sum of its proper divisors (269505018).

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

168440490 is a wasteful number, since it uses less digits than its factorization.

168440490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871574 (or 1871571 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 168440490 is about 12978.4625437684. The cubic root of 168440490 is about 552.2666677826.

The spelling of 168440490 in words is "one hundred sixty-eight million, four hundred forty thousand, four hundred ninety".