1801949 has 4 divisors (see below), whose sum is σ = 1907964. Its totient is φ = 1695936.

The previous prime is 1801931. The next prime is 1801967. The reversal of 1801949 is 9491081.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1801931) and next prime (1801967).

It can be written as a sum of positive squares in 2 ways, for example, as 1036324 + 765625 = 1018^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801949 - 2²⁰ = 753373 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 (1801549) 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, 52982 + ... + 53015.

It is an arithmetic number, because the mean of its divisors is an integer number (476991).

2^1801949 is an apocalyptic number.

It is an amenable number.

1801949 is a deficient number, since it is larger than the sum of its proper divisors (106015).

1801949 is a wasteful number, since it uses less digits than its factorization.

1801949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106014.

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

The square root of 1801949 is about 1342.3669394022. The cubic root of 1801949 is about 121.6879285625.

The spelling of 1801949 in words is "one million, eight hundred one thousand, nine hundred forty-nine".