780139801 has 4 divisors (see below), whose sum is σ = 891588352. Its totient is φ = 668691252.

The previous prime is 780139799. The next prime is 780139823. The reversal of 780139801 is 108931087.

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 a cyclic number.

It is not a de Polignac number, because 780139801 - 2¹ = 780139799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780139891) 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, 55724265 + ... + 55724278.

It is an arithmetic number, because the mean of its divisors is an integer number (222897088).

Almost surely, 2^780139801 is an apocalyptic number.

It is an amenable number.

780139801 is a deficient number, since it is larger than the sum of its proper divisors (111448551).

780139801 is a wasteful number, since it uses less digits than its factorization.

780139801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111448550.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 780139801 is about 27930.9828147883. The cubic root of 780139801 is about 920.5714003143.

The spelling of 780139801 in words is "seven hundred eighty million, one hundred thirty-nine thousand, eight hundred one".