1155657387 has 18 divisors (see below), whose sum is σ = 1627819452. Its totient is φ = 729182304.

The previous prime is 1155657361. The next prime is 1155657407. The reversal of 1155657387 is 7837565511.

It is not a de Polignac number, because 1155657387 - 2⁶ = 1155657323 is a prime.

It is a super-2 number, since 2×1155657387² = 2671087992255335538, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155657187) 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 17 ways as a sum of consecutive naturals, for example, 1118223 + ... + 1119255.

It is an arithmetic number, because the mean of its divisors is an integer number (90434414).

Almost surely, 2^1155657387 is an apocalyptic number.

1155657387 is a deficient number, since it is larger than the sum of its proper divisors (472162065).

1155657387 is an frugal number, since it uses more digits than its factorization.

1155657387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2107 (or 1055 counting only the distinct ones).

The product of its digits is 882000, while the sum is 48.

The square root of 1155657387 is about 33994.9612001544. The cubic root of 1155657387 is about 1049.4047683034.

Multiplying 1155657387 by its sum of digits (48), we get a square (55471554576 = 235524²).

The spelling of 1155657387 in words is "one billion, one hundred fifty-five million, six hundred fifty-seven thousand, three hundred eighty-seven".