139928869 has 2 divisors, whose sum is σ = 139928870. Its totient is φ = 139928868.

The previous prime is 139928861. The next prime is 139928881. The reversal of 139928869 is 968829931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125776225 + 14152644 = 11215^2 + 3762^2 .

It is a cyclic number.

It is not a de Polignac number, because 139928869 - 2³ = 139928861 is a prime.

It is a super-2 number, since 2×139928869² = 39160176759238322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139928861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69964434 + 69964435.

It is an arithmetic number, because the mean of its divisors is an integer number (69964435).

Almost surely, 2^139928869 is an apocalyptic number.

It is an amenable number.

139928869 is a deficient number, since it is larger than the sum of its proper divisors (1).

139928869 is an equidigital number, since it uses as much as digits as its factorization.

139928869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 55.

The square root of 139928869 is about 11829.1533509377. The cubic root of 139928869 is about 519.1614554546.

The spelling of 139928869 in words is "one hundred thirty-nine million, nine hundred twenty-eight thousand, eight hundred sixty-nine".