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620995 = 5124199
BaseRepresentation
bin10010111100111000011
31011112211211
42113213003
5124332440
621150551
75164324
oct2274703
91145754
10620995
11394621
1225b457
1318986b
1412244b
15c3eea
hex979c3

620995 has 4 divisors (see below), whose sum is σ = 745200. Its totient is φ = 496792.

The previous prime is 620981. The next prime is 620999. The reversal of 620995 is 599026.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 599026 = 2299513.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-620995 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

620995 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (620999) 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, 62095 + ... + 62104.

It is an arithmetic number, because the mean of its divisors is an integer number (186300).

2620995 is an apocalyptic number.

620995 is a deficient number, since it is larger than the sum of its proper divisors (124205).

620995 is a wasteful number, since it uses less digits than its factorization.

620995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124204.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 620995 is about 788.0323597417. The cubic root of 620995 is about 85.3157804201.

The spelling of 620995 in words is "six hundred twenty thousand, nine hundred ninety-five".

Divisors: 1 5 124199 620995