1873649 has 4 divisors (see below), whose sum is σ = 1955136. Its totient is φ = 1792164.

The previous prime is 1873637. The next prime is 1873657. The reversal of 1873649 is 9463781.

1873649 = 41² + 42² + ... + 178².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9463781 = 17 ⋅556693.

It is a cyclic number.

It is not a de Polignac number, because 1873649 - 2⁴ = 1873633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1873679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40709 + ... + 40754.

It is an arithmetic number, because the mean of its divisors is an integer number (488784).

2^1873649 is an apocalyptic number.

It is an amenable number.

1873649 is a deficient number, since it is larger than the sum of its proper divisors (81487).

1873649 is an equidigital number, since it uses as much as digits as its factorization.

1873649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81486.

The product of its digits is 36288, while the sum is 38.

The square root of 1873649 is about 1368.8129894182. The cubic root of 1873649 is about 123.2809801337.

The spelling of 1873649 in words is "one million, eight hundred seventy-three thousand, six hundred forty-nine".