38709945 has 24 divisors (see below), whose sum is σ = 68737032. Its totient is φ = 20140800.

The previous prime is 38709941. The next prime is 38709947. The reversal of 38709945 is 54990783.

It can be written as a sum of positive squares in 4 ways, for example, as 71289 + 38638656 = 267^2 + 6216^2 .

It is not a de Polignac number, because 38709945 - 2² = 38709941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 38709945.

It is not an unprimeable number, because it can be changed into a prime (38709941) 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, 8646 + ... + 12335.

It is an arithmetic number, because the mean of its divisors is an integer number (2864043).

Almost surely, 2^38709945 is an apocalyptic number.

It is an amenable number.

38709945 is a deficient number, since it is larger than the sum of its proper divisors (30027087).

38709945 is a wasteful number, since it uses less digits than its factorization.

38709945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21033 (or 21030 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 38709945 is about 6221.7316721312. The cubic root of 38709945 is about 338.2783353270.

The spelling of 38709945 in words is "thirty-eight million, seven hundred nine thousand, nine hundred forty-five".