1212401309 has 8 divisors (see below), whose sum is σ = 1396512768. Its totient is φ = 1031017680.

The previous prime is 1212401269. The next prime is 1212401321. The reversal of 1212401309 is 9031042121.

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-1212401309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212401339) 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, 681002 + ... + 682779.

It is an arithmetic number, because the mean of its divisors is an integer number (174564096).

Almost surely, 2^1212401309 is an apocalyptic number.

It is an amenable number.

1212401309 is a deficient number, since it is larger than the sum of its proper divisors (184111459).

1212401309 is a wasteful number, since it uses less digits than its factorization.

1212401309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363915.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1212401309 is about 34819.5535439500. The cubic root of 1212401309 is about 1066.3066856337.

The spelling of 1212401309 in words is "one billion, two hundred twelve million, four hundred one thousand, three hundred nine".