1229918740 has 12 divisors (see below), whose sum is σ = 2582829396. Its totient is φ = 491967488.

The previous prime is 1229918699. The next prime is 1229918741. The reversal of 1229918740 is 478199221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 577729296 + 652189444 = 24036^2 + 25538^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229918741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30747949 + ... + 30747988.

It is an arithmetic number, because the mean of its divisors is an integer number (215235783).

Almost surely, 2^1229918740 is an apocalyptic number.

1229918740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1229918740 is an abundant number, since it is smaller than the sum of its proper divisors (1352910656).

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

1229918740 is a wasteful number, since it uses less digits than its factorization.

1229918740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61495946 (or 61495944 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1229918740 is about 35070.1973190913. The cubic root of 1229918740 is about 1071.4176742341.

The spelling of 1229918740 in words is "one billion, two hundred twenty-nine million, nine hundred eighteen thousand, seven hundred forty".