180421840 has 40 divisors (see below), whose sum is σ = 420473088. Its totient is φ = 71998080.

The previous prime is 180421837. The next prime is 180421883. The reversal of 180421840 is 48124081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 180421799 and 180421808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34605 + ... + 39475.

Almost surely, 2^180421840 is an apocalyptic number.

180421840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180421840 is an abundant number, since it is smaller than the sum of its proper divisors (240051248).

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

180421840 is a wasteful number, since it uses less digits than its factorization.

180421840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5347 (or 5341 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 180421840 is about 13432.1197135821. The cubic root of 180421840 is about 565.0623472587.

The spelling of 180421840 in words is "one hundred eighty million, four hundred twenty-one thousand, eight hundred forty".