1229486640 has 80 divisors (see below), whose sum is σ = 3850774368. Its totient is φ = 324476928.

The previous prime is 1229486627. The next prime is 1229486641. The reversal of 1229486640 is 466849221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1229486592 and 1229486601.

It is not an unprimeable number, because it can be changed into a prime (1229486641) 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, 3127 + ... + 49686.

Almost surely, 2^1229486640 is an apocalyptic number.

1229486640 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 1229486640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1925387184).

1229486640 is an abundant number, since it is smaller than the sum of its proper divisors (2621287728).

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

1229486640 is a wasteful number, since it uses less digits than its factorization.

1229486640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52926 (or 52920 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1229486640 is about 35064.0362765042. The cubic root of 1229486640 is about 1071.2921879482.

The spelling of 1229486640 in words is "one billion, two hundred twenty-nine million, four hundred eighty-six thousand, six hundred forty".