1229359640 has 16 divisors (see below), whose sum is σ = 2766059280. Its totient is φ = 491743840.

The previous prime is 1229359633. The next prime is 1229359643. The reversal of 1229359640 is 469539221.

It is a super-2 number, since 2×1229359640² = 3022650248921859200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229359643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15366956 + ... + 15367035.

It is an arithmetic number, because the mean of its divisors is an integer number (172878705).

Almost surely, 2^1229359640 is an apocalyptic number.

1229359640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1229359640 is an abundant number, since it is smaller than the sum of its proper divisors (1536699640).

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

1229359640 is a wasteful number, since it uses less digits than its factorization.

1229359640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30734002 (or 30733998 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 1229359640 is about 35062.2252573906. The cubic root of 1229359640 is about 1071.2553002510.

The spelling of 1229359640 in words is "one billion, two hundred twenty-nine million, three hundred fifty-nine thousand, six hundred forty".