1873409 has 2 divisors, whose sum is σ = 1873410. Its totient is φ = 1873408.

The previous prime is 1873379. The next prime is 1873411. The reversal of 1873409 is 9043781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1113025 + 760384 = 1055^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1873409 - 2²⁰ = 824833 is a prime.

It is a super-2 number, since 2×1873409² = 7019322562562, which contains 22 as substring.

Together with 1873411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1873499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936704 + 936705.

It is an arithmetic number, because the mean of its divisors is an integer number (936705).

2^1873409 is an apocalyptic number.

It is an amenable number.

1873409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1873409 is an equidigital number, since it uses as much as digits as its factorization.

1873409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1873409 is about 1368.7253194122. The cubic root of 1873409 is about 123.2757161277.

The spelling of 1873409 in words is "one million, eight hundred seventy-three thousand, four hundred nine".