101489840 has 20 divisors (see below), whose sum is σ = 235964064. Its totient is φ = 40595904.

The previous prime is 101489837. The next prime is 101489851. The reversal of 101489840 is 48984101.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 101489840.

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 3 ways as a sum of consecutive naturals, for example, 634232 + ... + 634391.

Almost surely, 2^101489840 is an apocalyptic number.

101489840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101489840 is an abundant number, since it is smaller than the sum of its proper divisors (134474224).

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

101489840 is a wasteful number, since it uses less digits than its factorization.

101489840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268636 (or 1268630 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 101489840 is about 10074.2165948524. The cubic root of 101489840 is about 466.4526047718.

The spelling of 101489840 in words is "one hundred one million, four hundred eighty-nine thousand, eight hundred forty".