38745521 has 2 divisors, whose sum is σ = 38745522. Its totient is φ = 38745520.

The previous prime is 38745517. The next prime is 38745523. The reversal of 38745521 is 12554783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38688400 + 57121 = 6220^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 38745521 - 2² = 38745517 is a prime.

It is a super-2 number, since 2×38745521² = 3002430795122882, which contains 22 as substring.

Together with 38745523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38745523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19372760 + 19372761.

It is an arithmetic number, because the mean of its divisors is an integer number (19372761).

Almost surely, 2^38745521 is an apocalyptic number.

It is an amenable number.

38745521 is a deficient number, since it is larger than the sum of its proper divisors (1).

38745521 is an equidigital number, since it uses as much as digits as its factorization.

38745521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The square root of 38745521 is about 6224.5900266604. The cubic root of 38745521 is about 338.3819340722.

The spelling of 38745521 in words is "thirty-eight million, seven hundred forty-five thousand, five hundred twenty-one".