38421891 has 16 divisors (see below), whose sum is σ = 59397120. Its totient is φ = 24500520.

The previous prime is 38421841. The next prime is 38421893. The reversal of 38421891 is 19812483.

It is not a de Polignac number, because 38421891 - 2¹³ = 38413699 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38421893) 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, 30315 + ... + 31556.

It is an arithmetic number, because the mean of its divisors is an integer number (3712320).

Almost surely, 2^38421891 is an apocalyptic number.

38421891 is a deficient number, since it is larger than the sum of its proper divisors (20975229).

38421891 is a wasteful number, since it uses less digits than its factorization.

38421891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61903 (or 61897 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 38421891 is about 6198.5394247355. The cubic root of 38421891 is about 337.4371636104.

The spelling of 38421891 in words is "thirty-eight million, four hundred twenty-one thousand, eight hundred ninety-one".