1617974397 has 18 divisors (see below), whose sum is σ = 2530680282. Its totient is φ = 995675616.

The previous prime is 1617974383. The next prime is 1617974411. The reversal of 1617974397 is 7934797161.

1617974397 is a `hidden beast` number, since 16 + 179 + 74 + 397 = 666.

It is an interprime number because it is at equal distance from previous prime (1617974383) and next prime (1617974411).

It can be written as a sum of positive squares in 3 ways, for example, as 101183481 + 1516790916 = 10059^2 + 38946^2 .

It is not a de Polignac number, because 1617974397 - 2²⁸ = 1349538941 is a prime.

It is a super-2 number, since 2×1617974397² = 5235682298695027218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1617974327) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 530358 + ... + 533399.

It is an arithmetic number, because the mean of its divisors is an integer number (140593349).

Almost surely, 2^1617974397 is an apocalyptic number.

It is an amenable number.

1617974397 is a deficient number, since it is larger than the sum of its proper divisors (912705885).

1617974397 is a wasteful number, since it uses less digits than its factorization.

1617974397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063789 (or 1063773 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The square root of 1617974397 is about 40224.0524686412. The cubic root of 1617974397 is about 1173.9705840128.

The spelling of 1617974397 in words is "one billion, six hundred seventeen million, nine hundred seventy-four thousand, three hundred ninety-seven".