2787421 has 8 divisors (see below), whose sum is σ = 3430784. Its totient is φ = 2205360.

The previous prime is 2787419. The next prime is 2787443. The reversal of 2787421 is 1247872.

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

It is a cyclic number.

It is not a de Polignac number, because 2787421 - 2¹ = 2787419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2787461) 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, 15225 + ... + 15406.

It is an arithmetic number, because the mean of its divisors is an integer number (428848).

2^2787421 is an apocalyptic number.

It is an amenable number.

2787421 is a deficient number, since it is larger than the sum of its proper divisors (643363).

2787421 is a wasteful number, since it uses less digits than its factorization.

2787421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30651.

The product of its digits is 6272, while the sum is 31.

The square root of 2787421 is about 1669.5571269052. The cubic root of 2787421 is about 140.7345911808.

The spelling of 2787421 in words is "two million, seven hundred eighty-seven thousand, four hundred twenty-one".