1187157906 has 48 divisors (see below), whose sum is σ = 2971077408. Its totient is φ = 338582400.

The previous prime is 1187157863. The next prime is 1187157931. The reversal of 1187157906 is 6097517811.

1187157906 is a `hidden beast` number, since 1 + 1 + 8 + 71 + 579 + 0 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172980 + ... + 179711.

It is an arithmetic number, because the mean of its divisors is an integer number (61897446).

Almost surely, 2^1187157906 is an apocalyptic number.

1187157906 is an abundant number, since it is smaller than the sum of its proper divisors (1783919502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1187157906 is a wasteful number, since it uses less digits than its factorization.

1187157906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352727 (or 352724 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 45.

The square root of 1187157906 is about 34455.1579012490. The cubic root of 1187157906 is about 1058.8541985899.

It can be divided in two parts, 118715 and 7906, that added together give a palindrome (126621).

The spelling of 1187157906 in words is "one billion, one hundred eighty-seven million, one hundred fifty-seven thousand, nine hundred six".