288691397 has 4 divisors (see below), whose sum is σ = 290420256. Its totient is φ = 286962540.

The previous prime is 288691393. The next prime is 288691411. The reversal of 288691397 is 793196882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 793196882 = 2 ⋅396598441.

It is a cyclic number.

It is not a de Polignac number, because 288691397 - 2² = 288691393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288691393) 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, 864179 + ... + 864512.

It is an arithmetic number, because the mean of its divisors is an integer number (72605064).

Almost surely, 2^288691397 is an apocalyptic number.

It is an amenable number.

288691397 is a deficient number, since it is larger than the sum of its proper divisors (1728859).

288691397 is a wasteful number, since it uses less digits than its factorization.

288691397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728858.

The product of its digits is 1306368, while the sum is 53.

The square root of 288691397 is about 16990.9210168254. The cubic root of 288691397 is about 660.9134863882.

The spelling of 288691397 in words is "two hundred eighty-eight million, six hundred ninety-one thousand, three hundred ninety-seven".