1620207 has 6 divisors (see below), whose sum is σ = 2340312. Its totient is φ = 1080132.

The previous prime is 1620161. The next prime is 1620209. The reversal of 1620207 is 7020261.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1620207 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620209) 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 5 ways as a sum of consecutive naturals, for example, 90003 + ... + 90020.

It is an arithmetic number, because the mean of its divisors is an integer number (390052).

2^1620207 is an apocalyptic number.

1620207 is a deficient number, since it is larger than the sum of its proper divisors (720105).

1620207 is a wasteful number, since it uses less digits than its factorization.

1620207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180029 (or 180026 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 1620207 is about 1272.8735208182. The cubic root of 1620207 is about 117.4510313529.

Adding to 1620207 its reverse (7020261), we get a palindrome (8640468).

The spelling of 1620207 in words is "one million, six hundred twenty thousand, two hundred seven".