619947854 has 4 divisors (see below), whose sum is σ = 929921784. Its totient is φ = 309973926.

The previous prime is 619947847. The next prime is 619947953. The reversal of 619947854 is 458749916.

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

It is a junction number, because it is equal to n+sod(n) for n = 619947796 and 619947805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154986962 + ... + 154986965.

It is an arithmetic number, because the mean of its divisors is an integer number (232480446).

Almost surely, 2^619947854 is an apocalyptic number.

619947854 is a deficient number, since it is larger than the sum of its proper divisors (309973930).

619947854 is a wasteful number, since it uses less digits than its factorization.

619947854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309973929.

The product of its digits is 2177280, while the sum is 53.

The square root of 619947854 is about 24898.7520570811. The cubic root of 619947854 is about 852.6779917476.

The spelling of 619947854 in words is "six hundred nineteen million, nine hundred forty-seven thousand, eight hundred fifty-four".