721134140 has 24 divisors (see below), whose sum is σ = 1514942352. Its totient is φ = 288346880.

The previous prime is 721134103. The next prime is 721134217. The reversal of 721134140 is 41431127.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70427 + ... + 80013.

It is an arithmetic number, because the mean of its divisors is an integer number (63122598).

Almost surely, 2^721134140 is an apocalyptic number.

It is an amenable number.

721134140 is an abundant number, since it is smaller than the sum of its proper divisors (793808212).

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

721134140 is a wasteful number, since it uses less digits than its factorization.

721134140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13357 (or 13355 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 721134140 is about 26853.9408653553. The cubic root of 721134140 is about 896.7513080197.

Adding to 721134140 its reverse (41431127), we get a palindrome (762565267).

The spelling of 721134140 in words is "seven hundred twenty-one million, one hundred thirty-four thousand, one hundred forty".