147981840 has 80 divisors (see below), whose sum is σ = 459934848. Its totient is φ = 39359488.

The previous prime is 147981829. The next prime is 147981857. The reversal of 147981840 is 48189741.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 147981792 and 147981801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154804 + ... + 155756.

Almost surely, 2^147981840 is an apocalyptic number.

147981840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 147981840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229967424).

147981840 is an abundant number, since it is smaller than the sum of its proper divisors (311953008).

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

147981840 is a wasteful number, since it uses less digits than its factorization.

147981840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616 (or 1610 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 147981840 is about 12164.7786662972. The cubic root of 147981840 is about 528.9356115565.

The spelling of 147981840 in words is "one hundred forty-seven million, nine hundred eighty-one thousand, eight hundred forty".