674388187 has 4 divisors (see below), whose sum is σ = 735696216. Its totient is φ = 613080160.

The previous prime is 674388173. The next prime is 674388199. The reversal of 674388187 is 781883476.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 674388187 - 2¹⁵ = 674355419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (674388137) 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, 30653998 + ... + 30654019.

It is an arithmetic number, because the mean of its divisors is an integer number (183924054).

Almost surely, 2^674388187 is an apocalyptic number.

674388187 is a deficient number, since it is larger than the sum of its proper divisors (61308029).

674388187 is a wasteful number, since it uses less digits than its factorization.

674388187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61308028.

The product of its digits is 1806336, while the sum is 52.

The square root of 674388187 is about 25968.9850976121. The cubic root of 674388187 is about 876.9402114146.

It can be divided in two parts, 67438 and 8187, that added together give a square (75625 = 275²).

The spelling of 674388187 in words is "six hundred seventy-four million, three hundred eighty-eight thousand, one hundred eighty-seven".