1662407 has 4 divisors (see below), whose sum is σ = 1682520. Its totient is φ = 1642296.

The previous prime is 1662403. The next prime is 1662439. The reversal of 1662407 is 7042661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7042661 = 967 ⋅7283.

It is a cyclic number.

It is not a de Polignac number, because 1662407 - 2² = 1662403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9932 + ... + 10097.

It is an arithmetic number, because the mean of its divisors is an integer number (420630).

2^1662407 is an apocalyptic number.

1662407 is a deficient number, since it is larger than the sum of its proper divisors (20113).

1662407 is an equidigital number, since it uses as much as digits as its factorization.

1662407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20112.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1662407 is about 1289.3436314653. The cubic root of 1662407 is about 118.4620161097.

The spelling of 1662407 in words is "one million, six hundred sixty-two thousand, four hundred seven".