280138914 has 48 divisors (see below), whose sum is σ = 680060160. Its totient is φ = 82594080.

The previous prime is 280138913. The next prime is 280138931. The reversal of 280138914 is 419831082.

It is a super-2 number, since 2×280138914² = 156955622274198792, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (280138913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11794 + ... + 26445.

It is an arithmetic number, because the mean of its divisors is an integer number (14167920).

Almost surely, 2^280138914 is an apocalyptic number.

280138914 is an abundant number, since it is smaller than the sum of its proper divisors (399921246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280138914 is a wasteful number, since it uses less digits than its factorization.

280138914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38295 (or 38292 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 280138914 is about 16737.3508656537. The cubic root of 280138914 is about 654.3214338903.

Adding to 280138914 its reverse (419831082), we get a palindrome (699969996).

The spelling of 280138914 in words is "two hundred eighty million, one hundred thirty-eight thousand, nine hundred fourteen".