974138209 has 6 divisors (see below), whose sum is σ = 1070747090. Its totient is φ = 885580080.

The previous prime is 974138201. The next prime is 974138237. The reversal of 974138209 is 902831479.

It can be written as a sum of positive squares in only one way, i.e., 604422225 + 369715984 = 24585^2 + 19228^2 .

It is not a de Polignac number, because 974138209 - 2³ = 974138201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (974138201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4025244 + ... + 4025485.

Almost surely, 2^974138209 is an apocalyptic number.

It is an amenable number.

974138209 is a deficient number, since it is larger than the sum of its proper divisors (96608881).

974138209 is a wasteful number, since it uses less digits than its factorization.

974138209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8050751 (or 8050740 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 974138209 is about 31211.1872411160. The cubic root of 974138209 is about 991.3040018138.

The spelling of 974138209 in words is "nine hundred seventy-four million, one hundred thirty-eight thousand, two hundred nine".