38722913 has 8 divisors (see below), whose sum is σ = 39748968. Its totient is φ = 37707904.

The previous prime is 38722907. The next prime is 38722927. The reversal of 38722913 is 31922783.

It can be written as a sum of positive squares in 4 ways, for example, as 24373969 + 14348944 = 4937^2 + 3788^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 38722913 - 2⁴ = 38722897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38722993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4595 + ... + 9927.

It is an arithmetic number, because the mean of its divisors is an integer number (4968621).

Almost surely, 2^38722913 is an apocalyptic number.

It is an amenable number.

38722913 is a deficient number, since it is larger than the sum of its proper divisors (1026055).

38722913 is a wasteful number, since it uses less digits than its factorization.

38722913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523.

The product of its digits is 18144, while the sum is 35.

The square root of 38722913 is about 6222.7737384546. The cubic root of 38722913 is about 338.3161060143.

The spelling of 38722913 in words is "thirty-eight million, seven hundred twenty-two thousand, nine hundred thirteen".