1252821 has 8 divisors (see below), whose sum is σ = 1680480. Its totient is φ = 830192.

The previous prime is 1252819. The next prime is 1252843. The reversal of 1252821 is 1282521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1252821 - 2¹ = 1252819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 630 + ... + 1703.

It is an arithmetic number, because the mean of its divisors is an integer number (210060).

2^1252821 is an apocalyptic number.

It is an amenable number.

1252821 is a deficient number, since it is larger than the sum of its proper divisors (427659).

1252821 is a wasteful number, since it uses less digits than its factorization.

1252821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515.

The product of its digits is 320, while the sum is 21.

The square root of 1252821 is about 1119.2948673160. The cubic root of 1252821 is about 107.8027090878.

The spelling of 1252821 in words is "one million, two hundred fifty-two thousand, eight hundred twenty-one".