1021872 has 40 divisors (see below), whose sum is σ = 2690800. Its totient is φ = 334080.

The previous prime is 1021861. The next prime is 1021879. The reversal of 1021872 is 2781201.

It is not an unprimeable number, because it can be changed into a prime (1021879) 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, 2754 + ... + 3102.

It is an arithmetic number, because the mean of its divisors is an integer number (67270).

2^1021872 is an apocalyptic number.

1021872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1345400).

1021872 is an abundant number, since it is smaller than the sum of its proper divisors (1668928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021872 is a wasteful number, since it uses less digits than its factorization.

1021872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1021872 is about 1010.8768470986. The cubic root of 1021872 is about 100.7238149455.

The spelling of 1021872 in words is "one million, twenty-one thousand, eight hundred seventy-two".