1121749720 has 128 divisors (see below), whose sum is σ = 3190723200. Its totient is φ = 345378816.

The previous prime is 1121749693. The next prime is 1121749747. The reversal of 1121749720 is 279471211.

It is an interprime number because it is at equal distance from previous prime (1121749693) and next prime (1121749747).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130516 + ... + 138844.

It is an arithmetic number, because the mean of its divisors is an integer number (24927525).

Almost surely, 2^1121749720 is an apocalyptic number.

1121749720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121749720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1595361600).

1121749720 is an abundant number, since it is smaller than the sum of its proper divisors (2068973480).

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

1121749720 is a wasteful number, since it uses less digits than its factorization.

1121749720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8397 (or 8393 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 1121749720 is about 33492.5323019923. The cubic root of 1121749720 is about 1039.0393372544.

The spelling of 1121749720 in words is "one billion, one hundred twenty-one million, seven hundred forty-nine thousand, seven hundred twenty".