74144989 has 2 divisors, whose sum is σ = 74144990. Its totient is φ = 74144988.

The previous prime is 74144981. The next prime is 74145017. The reversal of 74144989 is 98944147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55800900 + 18344089 = 7470^2 + 4283^2 .

It is an emirp because it is prime and its reverse (98944147) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74144989 - 2³ = 74144981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74144981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37072494 + 37072495.

It is an arithmetic number, because the mean of its divisors is an integer number (37072495).

Almost surely, 2^74144989 is an apocalyptic number.

It is an amenable number.

74144989 is a deficient number, since it is larger than the sum of its proper divisors (1).

74144989 is an equidigital number, since it uses as much as digits as its factorization.

74144989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 74144989 is about 8610.7484575965. The cubic root of 74144989 is about 420.1076613646.

It can be divided in two parts, 7414 and 4989, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 74144989 in words is "seventy-four million, one hundred forty-four thousand, nine hundred eighty-nine".