1827800421 has 16 divisors (see below), whose sum is σ = 2456812800. Its totient is φ = 1208701440.

The previous prime is 1827800413. The next prime is 1827800431. The reversal of 1827800421 is 1240087281.

It is a happy number.

It is not a de Polignac number, because 1827800421 - 2³ = 1827800413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1827800411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184605 + ... + 194253.

It is an arithmetic number, because the mean of its divisors is an integer number (153550800).

Almost surely, 2^1827800421 is an apocalyptic number.

It is an amenable number.

1827800421 is a deficient number, since it is larger than the sum of its proper divisors (629012379).

1827800421 is a wasteful number, since it uses less digits than its factorization.

1827800421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10156.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 1827800421 is about 42752.7826111939. The cubic root of 1827800421 is about 1222.6709423432.

The spelling of 1827800421 in words is "one billion, eight hundred twenty-seven million, eight hundred thousand, four hundred twenty-one".