1979666407 has 4 divisors (see below), whose sum is σ = 1979961480. Its totient is φ = 1979371336.

The previous prime is 1979666383. The next prime is 1979666443. The reversal of 1979666407 is 7046669791.

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 1979666407 - 2¹⁵ = 1979633639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979666467) 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, 137233 + ... + 150970.

It is an arithmetic number, because the mean of its divisors is an integer number (494990370).

Almost surely, 2^1979666407 is an apocalyptic number.

1979666407 is a deficient number, since it is larger than the sum of its proper divisors (295073).

1979666407 is an equidigital number, since it uses as much as digits as its factorization.

1979666407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295072.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The square root of 1979666407 is about 44493.4422920951. The cubic root of 1979666407 is about 1255.6367106150.

The spelling of 1979666407 in words is "one billion, nine hundred seventy-nine million, six hundred sixty-six thousand, four hundred seven".