1677979 has 4 divisors (see below), whose sum is σ = 1690920. Its totient is φ = 1665040.

The previous prime is 1677971. The next prime is 1677997. The reversal of 1677979 is 9797761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9797761 = 47 ⋅208463.

It is a cyclic number.

It is not a de Polignac number, because 1677979 - 2³ = 1677971 is a prime.

It is a super-2 number, since 2×1677979² = 5631227048882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1677971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6274 + ... + 6535.

It is an arithmetic number, because the mean of its divisors is an integer number (422730).

2^1677979 is an apocalyptic number.

1677979 is a deficient number, since it is larger than the sum of its proper divisors (12941).

1677979 is a wasteful number, since it uses less digits than its factorization.

1677979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12940.

The product of its digits is 166698, while the sum is 46.

The square root of 1677979 is about 1295.3682873994. The cubic root of 1677979 is about 118.8307506169.

The spelling of 1677979 in words is "one million, six hundred seventy-seven thousand, nine hundred seventy-nine".