280742942 has 4 divisors (see below), whose sum is σ = 421114416. Its totient is φ = 140371470.

The previous prime is 280742941. The next prime is 280742953. The reversal of 280742942 is 249247082.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 280742896 and 280742905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280742941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70185734 + ... + 70185737.

It is an arithmetic number, because the mean of its divisors is an integer number (105278604).

Almost surely, 2^280742942 is an apocalyptic number.

280742942 is a deficient number, since it is larger than the sum of its proper divisors (140371474).

280742942 is a wasteful number, since it uses less digits than its factorization.

280742942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140371473.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 280742942 is about 16755.3854625908. The cubic root of 280742942 is about 654.7913730607.

The spelling of 280742942 in words is "two hundred eighty million, seven hundred forty-two thousand, nine hundred forty-two".