620969 has 4 divisors (see below), whose sum is σ = 622596. Its totient is φ = 619344.

The previous prime is 620957. The next prime is 620981. The reversal of 620969 is 969026.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (620957) and next prime (620981).

It can be written as a sum of positive squares in 2 ways, for example, as 1600 + 619369 = 40^2 + 787^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620969 is a prime.

It is a super-2 number, since 2×620969² = 771204997922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (620909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107 + ... + 1119.

It is an arithmetic number, because the mean of its divisors is an integer number (155649).

2⁶²⁰⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

620969 is a deficient number, since it is larger than the sum of its proper divisors (1627).

620969 is a wasteful number, since it uses less digits than its factorization.

620969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 620969 is about 788.0158627845. The cubic root of 620969 is about 85.3145897282.

The spelling of 620969 in words is "six hundred twenty thousand, nine hundred sixty-nine".