619939 has 4 divisors (see below), whose sum is σ = 656424. Its totient is φ = 583456.

The previous prime is 619921. The next prime is 619967. The reversal of 619939 is 939916.

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

It is a cyclic number.

It is not a de Polignac number, because 619939 - 2⁷ = 619811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 619898 and 619907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (619909) 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, 18217 + ... + 18250.

It is an arithmetic number, because the mean of its divisors is an integer number (164106).

2⁶¹⁹⁹³⁹ is an apocalyptic number.

619939 is a deficient number, since it is larger than the sum of its proper divisors (36485).

619939 is a wasteful number, since it uses less digits than its factorization.

619939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36484.

The product of its digits is 13122, while the sum is 37.

The square root of 619939 is about 787.3620514096. The cubic root of 619939 is about 85.2673932456.

It can be divided in two parts, 61 and 9939, that added together give a 4-th power (10000 = 10⁴).

The spelling of 619939 in words is "six hundred nineteen thousand, nine hundred thirty-nine".