1187494397 has 2 divisors, whose sum is σ = 1187494398. Its totient is φ = 1187494396.

The previous prime is 1187494327. The next prime is 1187494403. The reversal of 1187494397 is 7934947811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 830246596 + 357247801 = 28814^2 + 18901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187494397 - 2¹² = 1187490301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187494307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593747198 + 593747199.

It is an arithmetic number, because the mean of its divisors is an integer number (593747199).

Almost surely, 2^1187494397 is an apocalyptic number.

It is an amenable number.

1187494397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187494397 is an equidigital number, since it uses as much as digits as its factorization.

1187494397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 1187494397 is about 34460.0405832611. The cubic root of 1187494397 is about 1058.9542305650.

The spelling of 1187494397 in words is "one billion, one hundred eighty-seven million, four hundred ninety-four thousand, three hundred ninety-seven".