1902121 has 4 divisors (see below), whose sum is σ = 2048452. Its totient is φ = 1755792.

The previous prime is 1902119. The next prime is 1902127. The reversal of 1902121 is 1212091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1212091 = 89 ⋅13619.

It can be written as a sum of positive squares in 2 ways, for example, as 1155625 + 746496 = 1075^2 + 864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1902121 - 2¹ = 1902119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1902095 and 1902104.

It is not an unprimeable number, because it can be changed into a prime (1902127) 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, 73146 + ... + 73171.

It is an arithmetic number, because the mean of its divisors is an integer number (512113).

2^1902121 is an apocalyptic number.

It is an amenable number.

1902121 is a deficient number, since it is larger than the sum of its proper divisors (146331).

1902121 is a wasteful number, since it uses less digits than its factorization.

1902121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146330.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1902121 is about 1379.1740281777. The cubic root of 1902121 is about 123.9023033804.

The spelling of 1902121 in words is "one million, nine hundred two thousand, one hundred twenty-one".