1321617072 has 40 divisors (see below), whose sum is σ = 3415781376. Its totient is φ = 440332096.

The previous prime is 1321617071. The next prime is 1321617109. The reversal of 1321617072 is 2707161231.

It is not an unprimeable number, because it can be changed into a prime (1321617071) 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, 123853 + ... + 134099.

Almost surely, 2^1321617072 is an apocalyptic number.

1321617072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321617072 is an abundant number, since it is smaller than the sum of its proper divisors (2094164304).

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

1321617072 is a wasteful number, since it uses less digits than its factorization.

1321617072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12945 (or 12939 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 1321617072 is about 36354.0516586528. The cubic root of 1321617072 is about 1097.4090735048.

The spelling of 1321617072 in words is "one billion, three hundred twenty-one million, six hundred seventeen thousand, seventy-two".