793978509 has 4 divisors (see below), whose sum is σ = 1058638016. Its totient is φ = 529319004.

The previous prime is 793978499. The next prime is 793978513. The reversal of 793978509 is 905879397.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 793978509 - 2⁵ = 793978477 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 (793978109) 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, 132329749 + ... + 132329754.

It is an arithmetic number, because the mean of its divisors is an integer number (264659504).

Almost surely, 2^793978509 is an apocalyptic number.

It is an amenable number.

793978509 is a deficient number, since it is larger than the sum of its proper divisors (264659507).

793978509 is a wasteful number, since it uses less digits than its factorization.

793978509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264659506.

The product of its (nonzero) digits is 4286520, while the sum is 57.

The square root of 793978509 is about 28177.6242611048. The cubic root of 793978509 is about 925.9827914240.

The spelling of 793978509 in words is "seven hundred ninety-three million, nine hundred seventy-eight thousand, five hundred nine".