1620969 has 12 divisors (see below), whose sum is σ = 2514384. Its totient is φ = 926184.

The previous prime is 1620961. The next prime is 1620973. The reversal of 1620969 is 9690261.

It is a happy number.

It is not a de Polignac number, because 1620969 - 2³ = 1620961 is a prime.

It is a super-2 number, since 2×1620969² = 5255080997922, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1620961) 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 11 ways as a sum of consecutive naturals, for example, 5367 + ... + 5660.

It is an arithmetic number, because the mean of its divisors is an integer number (209532).

2^1620969 is an apocalyptic number.

It is an amenable number.

1620969 is a deficient number, since it is larger than the sum of its proper divisors (893415).

1620969 is a wasteful number, since it uses less digits than its factorization.

1620969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11044 (or 11037 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 1620969 is about 1273.1728083807. The cubic root of 1620969 is about 117.4694412760.

The spelling of 1620969 in words is "one million, six hundred twenty thousand, nine hundred sixty-nine".