280055421 has 16 divisors (see below), whose sum is σ = 436734400. Its totient is φ = 176876784.

The previous prime is 280055417. The next prime is 280055437. The reversal of 280055421 is 124550082.

It is a happy number.

It is not a de Polignac number, because 280055421 - 2² = 280055417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280055491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272446 + ... + 273471.

It is an arithmetic number, because the mean of its divisors is an integer number (27295900).

Almost surely, 2^280055421 is an apocalyptic number.

It is an amenable number.

280055421 is a deficient number, since it is larger than the sum of its proper divisors (156678979).

280055421 is a wasteful number, since it uses less digits than its factorization.

280055421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545945 (or 545939 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 280055421 is about 16734.8564678637. The cubic root of 280055421 is about 654.2564224678.

The spelling of 280055421 in words is "two hundred eighty million, fifty-five thousand, four hundred twenty-one".