1972666 has 4 divisors (see below), whose sum is σ = 2959002. Its totient is φ = 986332.

The previous prime is 1972657. The next prime is 1972669. The reversal of 1972666 is 6662791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1879641 + 93025 = 1371^2 + 305^2 .

It is a super-2 number, since 2×1972666² = 7782822295112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1972669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493165 + ... + 493168.

2^1972666 is an apocalyptic number.

1972666 is a deficient number, since it is larger than the sum of its proper divisors (986336).

1972666 is an equidigital number, since it uses as much as digits as its factorization.

1972666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986335.

The product of its digits is 27216, while the sum is 37.

The square root of 1972666 is about 1404.5162868404. The cubic root of 1972666 is about 125.4154920672.

The spelling of 1972666 in words is "one million, nine hundred seventy-two thousand, six hundred sixty-six".