1796221509 has 16 divisors (see below), whose sum is σ = 2425628352. Its totient is φ = 1182169728.

The previous prime is 1796221507. The next prime is 1796221543. The reversal of 1796221509 is 9051226971.

It is not a de Polignac number, because 1796221509 - 2¹ = 1796221507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1796221507) 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, 614319 + ... + 617235.

It is an arithmetic number, because the mean of its divisors is an integer number (151601772).

Almost surely, 2^1796221509 is an apocalyptic number.

It is an amenable number.

1796221509 is a deficient number, since it is larger than the sum of its proper divisors (629406843).

1796221509 is a wasteful number, since it uses less digits than its factorization.

1796221509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 1796221509 is about 42381.8535342663. The cubic root of 1796221509 is about 1215.5886344873.

The spelling of 1796221509 in words is "one billion, seven hundred ninety-six million, two hundred twenty-one thousand, five hundred nine".