1921065 has 16 divisors (see below), whose sum is σ = 3110400. Its totient is φ = 1012352.

The previous prime is 1921063. The next prime is 1921069. The reversal of 1921065 is 5601291.

It is a cyclic number.

It is not a de Polignac number, because 1921065 - 2¹ = 1921063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1921063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616 + ... + 2054.

It is an arithmetic number, because the mean of its divisors is an integer number (194400).

2^1921065 is an apocalyptic number.

1921065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921065 is a deficient number, since it is larger than the sum of its proper divisors (1189335).

1921065 is a wasteful number, since it uses less digits than its factorization.

1921065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 1921065 is about 1386.0248915514. The cubic root of 1921065 is about 124.3122765642.

It can be divided in two parts, 192 and 1065, that multiplied together give a triangular number (204480 = T₆₃₉).

The spelling of 1921065 in words is "one million, nine hundred twenty-one thousand, sixty-five".