1797149779 has 8 divisors (see below), whose sum is σ = 1807803392. Its totient is φ = 1786526280.

The previous prime is 1797149743. The next prime is 1797149791. The reversal of 1797149779 is 9779417971.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1797149779 - 2¹¹ = 1797147731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1797149719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118312 + ... + 132634.

It is an arithmetic number, because the mean of its divisors is an integer number (225975424).

Almost surely, 2^1797149779 is an apocalyptic number.

1797149779 is a deficient number, since it is larger than the sum of its proper divisors (10653613).

1797149779 is a wasteful number, since it uses less digits than its factorization.

1797149779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15057.

The product of its digits is 7001316, while the sum is 61.

The square root of 1797149779 is about 42392.8033868958. The cubic root of 1797149779 is about 1215.7979999304.

The spelling of 1797149779 in words is "one billion, seven hundred ninety-seven million, one hundred forty-nine thousand, seven hundred seventy-nine".