139280769 has 16 divisors (see below), whose sum is σ = 209841600. Its totient is φ = 91279008.

The previous prime is 139280761. The next prime is 139280783. The reversal of 139280769 is 967082931.

It is not a de Polignac number, because 139280769 - 2³ = 139280761 is a prime.

It is a super-2 number, since 2×139280769² = 38798265226462722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139280761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42124 + ... + 45309.

It is an arithmetic number, because the mean of its divisors is an integer number (13115100).

Almost surely, 2^139280769 is an apocalyptic number.

It is an amenable number.

139280769 is a deficient number, since it is larger than the sum of its proper divisors (70560831).

139280769 is an equidigital number, since it uses as much as digits as its factorization.

139280769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87501 (or 87495 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 139280769 is about 11801.7273735670. The cubic root of 139280769 is about 518.3586919996.

The spelling of 139280769 in words is "one hundred thirty-nine million, two hundred eighty thousand, seven hundred sixty-nine".