33997387 has 2 divisors, whose sum is σ = 33997388. Its totient is φ = 33997386.

The previous prime is 33997373. The next prime is 33997409. The reversal of 33997387 is 78379933.

It is a weak prime.

It is an emirp because it is prime and its reverse (78379933) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33997387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 33997387.

It is not a weakly prime, because it can be changed into another prime (33997687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16998693 + 16998694.

It is an arithmetic number, because the mean of its divisors is an integer number (16998694).

Almost surely, 2^33997387 is an apocalyptic number.

33997387 is a deficient number, since it is larger than the sum of its proper divisors (1).

33997387 is an equidigital number, since it uses as much as digits as its factorization.

33997387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 49.

The square root of 33997387 is about 5830.7278276387. The cubic root of 33997387 is about 323.9528807920.

The spelling of 33997387 in words is "thirty-three million, nine hundred ninety-seven thousand, three hundred eighty-seven".