1205994813 has 16 divisors (see below), whose sum is σ = 1646627136. Its totient is φ = 784707840.

The previous prime is 1205994793. The next prime is 1205994833. The reversal of 1205994813 is 3184995021.

It is an interprime number because it is at equal distance from previous prime (1205994793) and next prime (1205994833).

It is not a de Polignac number, because 1205994813 - 2⁵ = 1205994781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205994833) 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, 226603 + ... + 231863.

It is an arithmetic number, because the mean of its divisors is an integer number (102914196).

Almost surely, 2^1205994813 is an apocalyptic number.

It is an amenable number.

1205994813 is a deficient number, since it is larger than the sum of its proper divisors (440632323).

1205994813 is a wasteful number, since it uses less digits than its factorization.

1205994813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7084.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1205994813 is about 34727.4360268650. The cubic root of 1205994813 is about 1064.4251971073.

The spelling of 1205994813 in words is "one billion, two hundred five million, nine hundred ninety-four thousand, eight hundred thirteen".