74157989 has 2 divisors, whose sum is σ = 74157990. Its totient is φ = 74157988.

The previous prime is 74157977. The next prime is 74158001. The reversal of 74157989 is 98975147.

It is a balanced prime because it is at equal distance from previous prime (74157977) and next prime (74158001).

It can be written as a sum of positive squares in only one way, i.e., 51595489 + 22562500 = 7183^2 + 4750^2 .

It is a cyclic number.

It is not a de Polignac number, because 74157989 - 2⁴ = 74157973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74157389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37078994 + 37078995.

It is an arithmetic number, because the mean of its divisors is an integer number (37078995).

Almost surely, 2^74157989 is an apocalyptic number.

It is an amenable number.

74157989 is a deficient number, since it is larger than the sum of its proper divisors (1).

74157989 is an equidigital number, since it uses as much as digits as its factorization.

74157989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 74157989 is about 8611.5032950119. The cubic root of 74157989 is about 420.1322127223.

The spelling of 74157989 in words is "seventy-four million, one hundred fifty-seven thousand, nine hundred eighty-nine".