38907643 has 2 divisors, whose sum is σ = 38907644. Its totient is φ = 38907642.

The previous prime is 38907641. The next prime is 38907653. The reversal of 38907643 is 34670983.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38907643 - 2¹ = 38907641 is a prime.

Together with 38907641, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 38907596 and 38907605.

It is not a weakly prime, because it can be changed into another prime (38907641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19453821 + 19453822.

It is an arithmetic number, because the mean of its divisors is an integer number (19453822).

Almost surely, 2^38907643 is an apocalyptic number.

38907643 is a deficient number, since it is larger than the sum of its proper divisors (1).

38907643 is an equidigital number, since it uses as much as digits as its factorization.

38907643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 38907643 is about 6237.5991374887. The cubic root of 38907643 is about 338.8532385960.

It can be divided in two parts, 38907 and 643, that multiplied together give a triangular number (25017201 = T₇₀₇₃).

The spelling of 38907643 in words is "thirty-eight million, nine hundred seven thousand, six hundred forty-three".