727121345 has 8 divisors (see below), whose sum is σ = 877367400. Its totient is φ = 578482560.

The previous prime is 727121327. The next prime is 727121383. The reversal of 727121345 is 543121727.

It can be written as a sum of positive squares in 4 ways, for example, as 26142769 + 700978576 = 5113^2 + 26476^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-727121345 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400820 + ... + 402629.

It is an arithmetic number, because the mean of its divisors is an integer number (109670925).

Almost surely, 2^727121345 is an apocalyptic number.

It is an amenable number.

727121345 is a deficient number, since it is larger than the sum of its proper divisors (150246055).

727121345 is a wasteful number, since it uses less digits than its factorization.

727121345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803635.

The product of its digits is 11760, while the sum is 32.

The square root of 727121345 is about 26965.1876500053. The cubic root of 727121345 is about 899.2262258856.

The spelling of 727121345 in words is "seven hundred twenty-seven million, one hundred twenty-one thousand, three hundred forty-five".