168420440 has 32 divisors (see below), whose sum is σ = 380540160. Its totient is φ = 67084800.

The previous prime is 168420437. The next prime is 168420457. The reversal of 168420440 is 44024861.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 905 + ... + 18375.

It is an arithmetic number, because the mean of its divisors is an integer number (11891880).

Almost surely, 2^168420440 is an apocalyptic number.

168420440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168420440 is an abundant number, since it is smaller than the sum of its proper divisors (212119720).

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

168420440 is a wasteful number, since it uses less digits than its factorization.

168420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17723 (or 17719 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 168420440 is about 12977.6900872228. The cubic root of 168420440 is about 552.2447542350.

The spelling of 168420440 in words is "one hundred sixty-eight million, four hundred twenty thousand, four hundred forty".