280138357 has 2 divisors, whose sum is σ = 280138358. Its totient is φ = 280138356.

The previous prime is 280138349. The next prime is 280138373. The reversal of 280138357 is 753831082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273373156 + 6765201 = 16534^2 + 2601^2 .

It is a cyclic number.

It is not a de Polignac number, because 280138357 - 2³ = 280138349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280138307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140069178 + 140069179.

It is an arithmetic number, because the mean of its divisors is an integer number (140069179).

Almost surely, 2^280138357 is an apocalyptic number.

It is an amenable number.

280138357 is a deficient number, since it is larger than the sum of its proper divisors (1).

280138357 is an equidigital number, since it uses as much as digits as its factorization.

280138357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 280138357 is about 16737.3342262142. The cubic root of 280138357 is about 654.3210002277.

The spelling of 280138357 in words is "two hundred eighty million, one hundred thirty-eight thousand, three hundred fifty-seven".