1948921 has 8 divisors (see below), whose sum is σ = 2112264. Its totient is φ = 1787520.

The previous prime is 1948909. The next prime is 1948927. The reversal of 1948921 is 1298491.

It can be written as a sum of positive squares in 4 ways, for example, as 44521 + 1904400 = 211^2 + 1380^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1948921 is a prime.

It is an Ulam number.

It is a Duffinian number.

1948921 is a lucky number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1948927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2181 + ... + 2941.

It is an arithmetic number, because the mean of its divisors is an integer number (264033).

2^1948921 is an apocalyptic number.

It is an amenable number.

1948921 is a deficient number, since it is larger than the sum of its proper divisors (163343).

1948921 is a wasteful number, since it uses less digits than its factorization.

1948921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971.

The product of its digits is 5184, while the sum is 34.

The square root of 1948921 is about 1396.0376069433. The cubic root of 1948921 is about 124.9102502419.

The spelling of 1948921 in words is "one million, nine hundred forty-eight thousand, nine hundred twenty-one".