1901849 has 4 divisors (see below), whose sum is σ = 1967460. Its totient is φ = 1836240.

The previous prime is 1901839. The next prime is 1901857. The reversal of 1901849 is 9481091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9481091 = 167 ⋅56773.

It can be written as a sum of positive squares in 2 ways, for example, as 413449 + 1488400 = 643^2 + 1220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901849 - 2⁴ = 1901833 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1901839) 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, 32762 + ... + 32819.

It is an arithmetic number, because the mean of its divisors is an integer number (491865).

2^1901849 is an apocalyptic number.

It is an amenable number.

1901849 is a deficient number, since it is larger than the sum of its proper divisors (65611).

1901849 is an equidigital number, since it uses as much as digits as its factorization.

1901849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65610.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1901849 is about 1379.0754149067. The cubic root of 1901849 is about 123.8963971608.

The spelling of 1901849 in words is "one million, nine hundred one thousand, eight hundred forty-nine".