280381966 has 4 divisors (see below), whose sum is σ = 420572952. Its totient is φ = 140190982.

The previous prime is 280381963. The next prime is 280381987. The reversal of 280381966 is 669183082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 669183082 = 2 ⋅334591541.

It is a super-2 number, since 2×280381966² = 157228093716050312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280381961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70095490 + ... + 70095493.

It is an arithmetic number, because the mean of its divisors is an integer number (105143238).

Almost surely, 2^280381966 is an apocalyptic number.

280381966 is a deficient number, since it is larger than the sum of its proper divisors (140190986).

280381966 is a wasteful number, since it uses less digits than its factorization.

280381966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140190985.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 280381966 is about 16744.6100581650. The cubic root of 280381966 is about 654.5106116565.

The spelling of 280381966 in words is "two hundred eighty million, three hundred eighty-one thousand, nine hundred sixty-six".