38690987 has 2 divisors, whose sum is σ = 38690988. Its totient is φ = 38690986.

The previous prime is 38690983. The next prime is 38690999. The reversal of 38690987 is 78909683.

It is a weak prime.

It is an emirp because it is prime and its reverse (78909683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38690987 - 2² = 38690983 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38690983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19345493 + 19345494.

It is an arithmetic number, because the mean of its divisors is an integer number (19345494).

Almost surely, 2^38690987 is an apocalyptic number.

38690987 is a deficient number, since it is larger than the sum of its proper divisors (1).

38690987 is an equidigital number, since it uses as much as digits as its factorization.

38690987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 38690987 is about 6220.2079547231. The cubic root of 38690987 is about 338.2231029409.

The spelling of 38690987 in words is "thirty-eight million, six hundred ninety thousand, nine hundred eighty-seven".