1156397 has 12 divisors (see below), whose sum is σ = 1340640. Its totient is φ = 993960.

The previous prime is 1156387. The next prime is 1156403. The reversal of 1156397 is 7936511.

It is not a de Polignac number, because 1156397 - 2⁶ = 1156333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2048 + ... + 2550.

It is an arithmetic number, because the mean of its divisors is an integer number (111720).

2^1156397 is an apocalyptic number.

It is an amenable number.

1156397 is a deficient number, since it is larger than the sum of its proper divisors (184243).

1156397 is a wasteful number, since it uses less digits than its factorization.

1156397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544 (or 533 counting only the distinct ones).

The product of its digits is 5670, while the sum is 32.

The square root of 1156397 is about 1075.3590098195. The cubic root of 1156397 is about 104.9628591240.

The spelling of 1156397 in words is "one million, one hundred fifty-six thousand, three hundred ninety-seven".