1999972 has 12 divisors (see below), whose sum is σ = 3769276. Its totient is φ = 923040.

The previous prime is 1999969. The next prime is 1999979. The reversal of 1999972 is 2799991.

It can be written as a sum of positive squares in 2 ways, for example, as 320356 + 1679616 = 566^2 + 1296^2 .

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1999979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19179 + ... + 19282.

2^1999972 is an apocalyptic number.

It is an amenable number.

1999972 is a deficient number, since it is larger than the sum of its proper divisors (1769304).

1999972 is a wasteful number, since it uses less digits than its factorization.

1999972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38478 (or 38476 counting only the distinct ones).

The product of its digits is 91854, while the sum is 46.

The square root of 1999972 is about 1414.2036628435. The cubic root of 1999972 is about 125.9915170236.

The spelling of 1999972 in words is "one million, nine hundred ninety-nine thousand, nine hundred seventy-two".