1921025 has 12 divisors (see below), whose sum is σ = 2438832. Its totient is φ = 1500240.

The previous prime is 1921021. The next prime is 1921027. The reversal of 1921025 is 5201291.

1921025 = 190² + 191² + ... + 232².

It is not a de Polignac number, because 1921025 - 2² = 1921021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1920988 and 1921006.

It is not an unprimeable number, because it can be changed into a prime (1921021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182 + ... + 1968.

It is an arithmetic number, because the mean of its divisors is an integer number (203236).

It is a Proth number, since it is equal to 469 ⋅ 2¹² + 1 and 469 < 2¹².

2^1921025 is an apocalyptic number.

It is an amenable number.

1921025 is a deficient number, since it is larger than the sum of its proper divisors (517807).

1921025 is a wasteful number, since it uses less digits than its factorization.

1921025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840 (or 1835 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1921025 is about 1386.0104617210. The cubic root of 1921025 is about 124.3114137571.

The spelling of 1921025 in words is "one million, nine hundred twenty-one thousand, twenty-five".