38657421 has 12 divisors (see below), whose sum is σ = 60914880. Its totient is φ = 23428680.

The previous prime is 38657407. The next prime is 38657461. The reversal of 38657421 is 12475683.

38657421 is a `hidden beast` number, since 3 + 86 + 574 + 2 + 1 = 666.

It is not a de Polignac number, because 38657421 - 2⁵ = 38657389 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38657461) 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, 195141 + ... + 195338.

It is an arithmetic number, because the mean of its divisors is an integer number (5076240).

Almost surely, 2^38657421 is an apocalyptic number.

It is an amenable number.

38657421 is a deficient number, since it is larger than the sum of its proper divisors (22257459).

38657421 is a wasteful number, since it uses less digits than its factorization.

38657421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390496 (or 390493 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 38657421 is about 6217.5092279787. The cubic root of 38657421 is about 338.1252672247.

The spelling of 38657421 in words is "thirty-eight million, six hundred fifty-seven thousand, four hundred twenty-one".