280139956 has 12 divisors (see below), whose sum is σ = 491843968. Its totient is φ = 139613112.

The previous prime is 280139953. The next prime is 280139983. The reversal of 280139956 is 659931082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280139953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112836 + ... + 115291.

Almost surely, 2^280139956 is an apocalyptic number.

It is an amenable number.

280139956 is a deficient number, since it is larger than the sum of its proper divisors (211704012).

280139956 is a wasteful number, since it uses less digits than its factorization.

280139956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228438 (or 228436 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 280139956 is about 16737.3819936094. The cubic root of 280139956 is about 654.3222451569.

The spelling of 280139956 in words is "two hundred eighty million, one hundred thirty-nine thousand, nine hundred fifty-six".