74433991 has 2 divisors, whose sum is σ = 74433992. Its totient is φ = 74433990.

The previous prime is 74433979. The next prime is 74434027. The reversal of 74433991 is 19933447.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19933447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74433991 - 2⁵ = 74433959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74433941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37216995 + 37216996.

It is an arithmetic number, because the mean of its divisors is an integer number (37216996).

Almost surely, 2^74433991 is an apocalyptic number.

74433991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74433991 is an equidigital number, since it uses as much as digits as its factorization.

74433991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The square root of 74433991 is about 8627.5136047415. The cubic root of 74433991 is about 420.6527849590.

The spelling of 74433991 in words is "seventy-four million, four hundred thirty-three thousand, nine hundred ninety-one".