168918840 has 48 divisors (see below), whose sum is σ = 548987400. Its totient is φ = 45044928.

The previous prime is 168918833. The next prime is 168918847. The reversal of 168918840 is 48819861.

168918840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (168918833) and next prime (168918847).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168918847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234250 + ... + 234969.

Almost surely, 2^168918840 is an apocalyptic number.

168918840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168918840 is an abundant number, since it is smaller than the sum of its proper divisors (380068560).

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

168918840 is a wasteful number, since it uses less digits than its factorization.

168918840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469236 (or 469229 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 168918840 is about 12996.8780866791. The cubic root of 168918840 is about 552.7889631799.

The spelling of 168918840 in words is "one hundred sixty-eight million, nine hundred eighteen thousand, eight hundred forty".