1921245 has 16 divisors (see below), whose sum is σ = 3091200. Its totient is φ = 1018944.

The previous prime is 1921229. The next prime is 1921247. The reversal of 1921245 is 5421291.

It is not a de Polignac number, because 1921245 - 2⁴ = 1921229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1921247) 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, 5052 + ... + 5418.

It is an arithmetic number, because the mean of its divisors is an integer number (193200).

2^1921245 is an apocalyptic number.

1921245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1921245 is a deficient number, since it is larger than the sum of its proper divisors (1169955).

1921245 is a wasteful number, since it uses less digits than its factorization.

1921245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724.

The product of its digits is 720, while the sum is 24.

The square root of 1921245 is about 1386.0898239292. The cubic root of 1921245 is about 124.3161590479.

The spelling of 1921245 in words is "one million, nine hundred twenty-one thousand, two hundred forty-five".