16779838 has 4 divisors (see below), whose sum is σ = 25169760. Its totient is φ = 8389918.

The previous prime is 16779823. The next prime is 16779839. The reversal of 16779838 is 83897761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83897761 = 409 ⋅205129.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 16779791 and 16779800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16779839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4194958 + ... + 4194961.

It is an arithmetic number, because the mean of its divisors is an integer number (6292440).

Almost surely, 2^16779838 is an apocalyptic number.

16779838 is a deficient number, since it is larger than the sum of its proper divisors (8389922).

16779838 is an equidigital number, since it uses as much as digits as its factorization.

16779838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8389921.

The product of its digits is 508032, while the sum is 49.

The square root of 16779838 is about 4096.3200558550. The cubic root of 16779838 is about 256.0133354870.

The spelling of 16779838 in words is "sixteen million, seven hundred seventy-nine thousand, eight hundred thirty-eight".