74861989 has 4 divisors (see below), whose sum is σ = 76885324. Its totient is φ = 72838656.

The previous prime is 74861977. The next prime is 74862013. The reversal of 74861989 is 98916847.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98916847 = 9199 ⋅10753.

It can be written as a sum of positive squares in 2 ways, for example, as 31169889 + 43692100 = 5583^2 + 6610^2 .

It is a cyclic number.

It is not a de Polignac number, because 74861989 - 2¹⁵ = 74829221 is a prime.

It is a super-2 number, since 2×74861989² = 11208634794072242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74861909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011612 + ... + 1011685.

It is an arithmetic number, because the mean of its divisors is an integer number (19221331).

Almost surely, 2^74861989 is an apocalyptic number.

It is an amenable number.

74861989 is a deficient number, since it is larger than the sum of its proper divisors (2023335).

74861989 is a wasteful number, since it uses less digits than its factorization.

74861989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023334.

The product of its digits is 870912, while the sum is 52.

The square root of 74861989 is about 8652.2823000640. The cubic root of 74861989 is about 421.4575005216.

The spelling of 74861989 in words is "seventy-four million, eight hundred sixty-one thousand, nine hundred eighty-nine".