38721449 has 24 divisors (see below), whose sum is σ = 45676800. Its totient is φ = 32685120.

The previous prime is 38721439. The next prime is 38721491. The reversal of 38721449 is 94412783.

It is a de Polignac number, because none of the positive numbers 2^k-38721449 is a prime.

It is a super-2 number, since 2×38721449² = 2998701225319202, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (38721439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99347 + ... + 99735.

It is an arithmetic number, because the mean of its divisors is an integer number (1903200).

Almost surely, 2^38721449 is an apocalyptic number.

It is an amenable number.

38721449 is a deficient number, since it is larger than the sum of its proper divisors (6955351).

38721449 is a wasteful number, since it uses less digits than its factorization.

38721449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 452 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 38721449 is about 6222.6561049121. The cubic root of 38721449 is about 338.3118423800.

The spelling of 38721449 in words is "thirty-eight million, seven hundred twenty-one thousand, four hundred forty-nine".