74403991 has 2 divisors, whose sum is σ = 74403992. Its totient is φ = 74403990.

The previous prime is 74403983. The next prime is 74404037. The reversal of 74403991 is 19930447.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 74403991 - 2³ = 74403983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74403991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74403391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37201995 + 37201996.

It is an arithmetic number, because the mean of its divisors is an integer number (37201996).

Almost surely, 2^74403991 is an apocalyptic number.

74403991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74403991 is an equidigital number, since it uses as much as digits as its factorization.

74403991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 74403991 is about 8625.7748057783. The cubic root of 74403991 is about 420.5962638313.

The spelling of 74403991 in words is "seventy-four million, four hundred three thousand, nine hundred ninety-one".