1801279 has 6 divisors (see below), whose sum is σ = 1836240. Its totient is φ = 1766700.

The previous prime is 1801273. The next prime is 1801297. The reversal of 1801279 is 9721081.

It is not a de Polignac number, because 1801279 - 2⁹ = 1800767 is a prime.

It is a super-3 number, since 3×1801279³ = 17533322146900921917, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11854 + ... + 12004.

It is an arithmetic number, because the mean of its divisors is an integer number (306040).

2^1801279 is an apocalyptic number.

1801279 is a deficient number, since it is larger than the sum of its proper divisors (34961).

1801279 is an frugal number, since it uses more digits than its factorization.

1801279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1801279 is about 1342.1173570147. The cubic root of 1801279 is about 121.6728447062.

It can be divided in two parts, 1801 and 279, that added together give a triangular number (2080 = T₆₄).

The spelling of 1801279 in words is "one million, eight hundred one thousand, two hundred seventy-nine".