1979649 has 27 divisors (see below), whose sum is σ = 3376737. Its totient is φ = 1114344.

The previous prime is 1979617. The next prime is 1979683. The reversal of 1979649 is 9469791.

1979649 = T₁₅₀ + T₁₅₁ + ... + T₂₄₇.

The square root of 1979649 is 1407.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1979649 - 2⁵ = 1979617 is a prime.

It is a Curzon number.

1979649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1979609) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 29514 + ... + 29580.

2^1979649 is an apocalyptic number.

1979649 is the 1407-th square number.

1979649 is the 704-th centered octagonal number.

It is an amenable number.

1979649 is a deficient number, since it is larger than the sum of its proper divisors (1397088).

1979649 is an equidigital number, since it uses as much as digits as its factorization.

1979649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 77 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The cubic root of 1979649 is about 125.5633030377.

It can be divided in two parts, 1979 and 649, that added together give a triangular number (2628 = T₇₂).

The spelling of 1979649 in words is "one million, nine hundred seventy-nine thousand, six hundred forty-nine".