1021972 has 48 divisors (see below), whose sum is σ = 2298240. Its totient is φ = 387072.

The previous prime is 1021963. The next prime is 1021973. The reversal of 1021972 is 2791201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021973) 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, 8988 + ... + 9100.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2^1021972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149120).

1021972 is an abundant number, since it is smaller than the sum of its proper divisors (1276268).

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

1021972 is a wasteful number, since it uses less digits than its factorization.

1021972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1021972 is about 1010.9263078979. The cubic root of 1021972 is about 100.7271004362.

The spelling of 1021972 in words is "one million, twenty-one thousand, nine hundred seventy-two".