1118556840 has 32 divisors (see below), whose sum is σ = 3355670880. Its totient is φ = 298281792.

The previous prime is 1118556839. The next prime is 1118556841. The reversal of 1118556840 is 486558111.

It is an interprime number because it is at equal distance from previous prime (1118556839) and next prime (1118556841).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1118556841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4660534 + ... + 4660773.

It is an arithmetic number, because the mean of its divisors is an integer number (104864715).

Almost surely, 2^1118556840 is an apocalyptic number.

1118556840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1118556840 is an abundant number, since it is smaller than the sum of its proper divisors (2237114040).

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

1118556840 is a wasteful number, since it uses less digits than its factorization.

1118556840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9321321 (or 9321317 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 1118556840 is about 33444.8327847517. The cubic root of 1118556840 is about 1038.0525810438.

The spelling of 1118556840 in words is "one billion, one hundred eighteen million, five hundred fifty-six thousand, eight hundred forty".