1191137840 has 40 divisors (see below), whose sum is σ = 2833808208. Its totient is φ = 465373440.

The previous prime is 1191137807. The next prime is 1191137917. The reversal of 1191137840 is 487311911.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1191137840.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169691 + ... + 176570.

Almost surely, 2^1191137840 is an apocalyptic number.

1191137840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191137840 is an abundant number, since it is smaller than the sum of its proper divisors (1642670368).

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

1191137840 is a wasteful number, since it uses less digits than its factorization.

1191137840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346317 (or 346311 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 1191137840 is about 34512.8648477637. The cubic root of 1191137840 is about 1060.0361444896.

The spelling of 1191137840 in words is "one billion, one hundred ninety-one million, one hundred thirty-seven thousand, eight hundred forty".