287293421 has 8 divisors (see below), whose sum is σ = 304344504. Its totient is φ = 270259200.

The previous prime is 287293411. The next prime is 287293423. The reversal of 287293421 is 124392782.

It can be written as a sum of positive squares in 4 ways, for example, as 45832900 + 241460521 = 6770^2 + 15539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-287293421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287293423) 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, 53771 + ... + 58871.

It is an arithmetic number, because the mean of its divisors is an integer number (38043063).

Almost surely, 2^287293421 is an apocalyptic number.

It is an amenable number.

287293421 is a deficient number, since it is larger than the sum of its proper divisors (17051083).

287293421 is a wasteful number, since it uses less digits than its factorization.

287293421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8431.

The product of its digits is 48384, while the sum is 38.

The square root of 287293421 is about 16949.7321807750. The cubic root of 287293421 is about 659.8449444445.

The spelling of 287293421 in words is "two hundred eighty-seven million, two hundred ninety-three thousand, four hundred twenty-one".