1178997940 has 48 divisors (see below), whose sum is σ = 2735534592. Its totient is φ = 424557056.

The previous prime is 1178997931. The next prime is 1178997949. The reversal of 1178997940 is 497998711.

It is an interprime number because it is at equal distance from previous prime (1178997931) and next prime (1178997949).

It is a super-2 number, since 2×1178997940² = 2780072285048487200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1178997949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67564 + ... + 83203.

It is an arithmetic number, because the mean of its divisors is an integer number (56990304).

Almost surely, 2^1178997940 is an apocalyptic number.

1178997940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1178997940 is an abundant number, since it is smaller than the sum of its proper divisors (1556536652).

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

1178997940 is a wasteful number, since it uses less digits than its factorization.

1178997940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150816 (or 150814 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 55.

The square root of 1178997940 is about 34336.5394295931. The cubic root of 1178997940 is about 1056.4225966334.

The spelling of 1178997940 in words is "one billion, one hundred seventy-eight million, nine hundred ninety-seven thousand, nine hundred forty".