1640972 has 6 divisors (see below), whose sum is σ = 2871708. Its totient is φ = 820484.

The previous prime is 1640971. The next prime is 1641007. The reversal of 1640972 is 2790461.

It is not an unprimeable number, because it can be changed into a prime (1640971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205118 + ... + 205125.

It is an arithmetic number, because the mean of its divisors is an integer number (478618).

2^1640972 is an apocalyptic number.

It is an amenable number.

1640972 is a deficient number, since it is larger than the sum of its proper divisors (1230736).

1640972 is a wasteful number, since it uses less digits than its factorization.

1640972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410247 (or 410245 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1640972 is about 1281.0042935135. The cubic root of 1640972 is about 117.9506640446.

The spelling of 1640972 in words is "one million, six hundred forty thousand, nine hundred seventy-two".