38491357 has 2 divisors, whose sum is σ = 38491358. Its totient is φ = 38491356.

The previous prime is 38491339. The next prime is 38491373. The reversal of 38491357 is 75319483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35354916 + 3136441 = 5946^2 + 1771^2 .

It is an emirp because it is prime and its reverse (75319483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38491357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38491307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19245678 + 19245679.

It is an arithmetic number, because the mean of its divisors is an integer number (19245679).

Almost surely, 2^38491357 is an apocalyptic number.

It is an amenable number.

38491357 is a deficient number, since it is larger than the sum of its proper divisors (1).

38491357 is an equidigital number, since it uses as much as digits as its factorization.

38491357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 38491357 is about 6204.1403111148. The cubic root of 38491357 is about 337.6404010268.

The spelling of 38491357 in words is "thirty-eight million, four hundred ninety-one thousand, three hundred fifty-seven".