280979138 has 16 divisors (see below), whose sum is σ = 460806624. Its totient is φ = 127433760.

The previous prime is 280979137. The next prime is 280979143. The reversal of 280979138 is 831979082.

It is a junction number, because it is equal to n+sod(n) for n = 280979092 and 280979101.

It is not an unprimeable number, because it can be changed into a prime (280979137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3920 + ... + 24027.

It is an arithmetic number, because the mean of its divisors is an integer number (28800414).

Almost surely, 2^280979138 is an apocalyptic number.

280979138 is a deficient number, since it is larger than the sum of its proper divisors (179827486).

280979138 is a wasteful number, since it uses less digits than its factorization.

280979138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28417.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 280979138 is about 16762.4323413996. The cubic root of 280979138 is about 654.9749523277.

The spelling of 280979138 in words is "two hundred eighty million, nine hundred seventy-nine thousand, one hundred thirty-eight".