1187947 has 2 divisors, whose sum is σ = 1187948. Its totient is φ = 1187946.

The previous prime is 1187941. The next prime is 1187981. The reversal of 1187947 is 7497811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1187947 - 2³ = 1187939 is a prime.

It is a super-2 number, since 2×1187947² = 2822436149618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1187941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593973 + 593974.

It is an arithmetic number, because the mean of its divisors is an integer number (593974).

2^1187947 is an apocalyptic number.

1187947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187947 is an equidigital number, since it uses as much as digits as its factorization.

1187947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 37.

The square root of 1187947 is about 1089.9298142541. The cubic root of 1187947 is about 105.9088750493.

The spelling of 1187947 in words is "one million, one hundred eighty-seven thousand, nine hundred forty-seven".