27938421 has 12 divisors (see below), whose sum is σ = 46120672. Its totient is φ = 15964776.

The previous prime is 27938401. The next prime is 27938423. The reversal of 27938421 is 12483972.

27938421 is a `hidden beast` number, since 279 + 384 + 2 + 1 = 666.

It is not a de Polignac number, because 27938421 - 2⁶ = 27938357 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 (27938423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221671 + ... + 221796.

Almost surely, 2^27938421 is an apocalyptic number.

27938421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27938421 is a deficient number, since it is larger than the sum of its proper divisors (18182251).

27938421 is a wasteful number, since it uses less digits than its factorization.

27938421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443480 (or 443477 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 27938421 is about 5285.6807508589. The cubic root of 27938421 is about 303.4361265217.

The spelling of 27938421 in words is "twenty-seven million, nine hundred thirty-eight thousand, four hundred twenty-one".