1801972 has 6 divisors (see below), whose sum is σ = 3153458. Its totient is φ = 900984.

The previous prime is 1801967. The next prime is 1801997. The reversal of 1801972 is 2791081.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 556516 = 1116^2 + 746^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1801972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225243 + ... + 225250.

2^1801972 is an apocalyptic number.

It is an amenable number.

1801972 is a deficient number, since it is larger than the sum of its proper divisors (1351486).

1801972 is a wasteful number, since it uses less digits than its factorization.

1801972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450497 (or 450495 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1801972 is about 1342.3755063320. The cubic root of 1801972 is about 121.6884463001.

Subtracting from 1801972 its product of nonzero digits (1008), we obtain a square (1800964 = 1342²).

The spelling of 1801972 in words is "one million, eight hundred one thousand, nine hundred seventy-two".