1640970 has 24 divisors (see below), whose sum is σ = 4266756. Its totient is φ = 437568.

The previous prime is 1640953. The next prime is 1640971. The reversal of 1640970 is 790461.

It can be written as a sum of positive squares in 2 ways, for example, as 1640961 + 9 = 1281^2 + 3^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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 in 11 ways as a sum of consecutive naturals, for example, 9027 + ... + 9206.

2^1640970 is an apocalyptic number.

1640970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640970 is an abundant number, since it is smaller than the sum of its proper divisors (2625786).

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

1640970 is a wasteful number, since it uses less digits than its factorization.

1640970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18246 (or 18243 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 1640970 is about 1281.0035128757. The cubic root of 1640970 is about 117.9506161256.

The spelling of 1640970 in words is "one million, six hundred forty thousand, nine hundred seventy".