1872405 has 12 divisors (see below), whose sum is σ = 3245580. Its totient is φ = 998592.

The previous prime is 1872389. The next prime is 1872419. The reversal of 1872405 is 5042781.

It can be written as a sum of positive squares in 2 ways, for example, as 1340964 + 531441 = 1158^2 + 729^2 .

It is not a de Polignac number, because 1872405 - 2⁴ = 1872389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20760 + ... + 20849.

It is an arithmetic number, because the mean of its divisors is an integer number (270465).

2^1872405 is an apocalyptic number.

1872405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1872405 is a deficient number, since it is larger than the sum of its proper divisors (1373175).

1872405 is a wasteful number, since it uses less digits than its factorization.

1872405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41620 (or 41617 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1872405 is about 1368.3585056556. The cubic root of 1872405 is about 123.2536901605.

The spelling of 1872405 in words is "one million, eight hundred seventy-two thousand, four hundred five".