1187304381 has 12 divisors (see below), whose sum is σ = 1731647008. Its totient is φ = 783850824.

The previous prime is 1187304379. The next prime is 1187304383. The reversal of 1187304381 is 1834037811.

It is an interprime number because it is at equal distance from previous prime (1187304379) and next prime (1187304383).

It is not a de Polignac number, because 1187304381 - 2¹ = 1187304379 is a prime.

It is a super-2 number, since 2×1187304381² = 2819383386283586322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187304383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 639475 + ... + 641328.

Almost surely, 2^1187304381 is an apocalyptic number.

It is an amenable number.

1187304381 is a deficient number, since it is larger than the sum of its proper divisors (544342627).

1187304381 is a wasteful number, since it uses less digits than its factorization.

1187304381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280912 (or 1280909 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1187304381 is about 34457.2834245534. The cubic root of 1187304381 is about 1058.8977449706.

The spelling of 1187304381 in words is "one billion, one hundred eighty-seven million, three hundred four thousand, three hundred eighty-one".