38149821 has 12 divisors (see below), whose sum is σ = 55652220. Its totient is φ = 25180800.

The previous prime is 38149799. The next prime is 38149823. The reversal of 38149821 is 12894183.

It can be written as a sum of positive squares in 2 ways, for example, as 27941796 + 10208025 = 5286^2 + 3195^2 .

It is not a de Polignac number, because 38149821 - 2¹¹ = 38147773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38149823) 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, 20076 + ... + 21893.

It is an arithmetic number, because the mean of its divisors is an integer number (4637685).

Almost surely, 2^38149821 is an apocalyptic number.

It is an amenable number.

38149821 is a deficient number, since it is larger than the sum of its proper divisors (17502399).

38149821 is a wasteful number, since it uses less digits than its factorization.

38149821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42076 (or 42073 counting only the distinct ones).

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

The square root of 38149821 is about 6176.5541364097. The cubic root of 38149821 is about 336.6387985733.

The spelling of 38149821 in words is "thirty-eight million, one hundred forty-nine thousand, eight hundred twenty-one".