1652021 has 16 divisors (see below), whose sum is σ = 2039808. Its totient is φ = 1306800.

The previous prime is 1652011. The next prime is 1652033. The reversal of 1652021 is 1202561.

It is a cyclic number.

It is not a de Polignac number, because 1652021 - 2¹⁴ = 1635637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1652011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4826 + ... + 5156.

It is an arithmetic number, because the mean of its divisors is an integer number (127488).

2^1652021 is an apocalyptic number.

It is an amenable number.

1652021 is a deficient number, since it is larger than the sum of its proper divisors (387787).

1652021 is a wasteful number, since it uses less digits than its factorization.

1652021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1652021 is about 1285.3096903081. The cubic root of 1652021 is about 118.2148007458.

Adding to 1652021 its reverse (1202561), we get a palindrome (2854582).

The spelling of 1652021 in words is "one million, six hundred fifty-two thousand, twenty-one".