1245420289 has 8 divisors (see below), whose sum is σ = 1319590440. Its totient is φ = 1171351296.

The previous prime is 1245420287. The next prime is 1245420299. The reversal of 1245420289 is 9820245421.

It can be written as a sum of positive squares in 4 ways, for example, as 188650225 + 1056770064 = 13735^2 + 32508^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1245420289 - 2¹ = 1245420287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245420287) 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, 847 + ... + 49915.

It is an arithmetic number, because the mean of its divisors is an integer number (164948805).

Almost surely, 2^1245420289 is an apocalyptic number.

It is an amenable number.

1245420289 is a deficient number, since it is larger than the sum of its proper divisors (74170151).

1245420289 is a wasteful number, since it uses less digits than its factorization.

1245420289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50579.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1245420289 is about 35290.5127335946. The cubic root of 1245420289 is about 1075.9001766706.

The spelling of 1245420289 in words is "one billion, two hundred forty-five million, four hundred twenty thousand, two hundred eighty-nine".