1961344399 has 16 divisors (see below), whose sum is σ = 2307073536. Its totient is φ = 1632708000.

The previous prime is 1961344397. The next prime is 1961344403. The reversal of 1961344399 is 9934431691.

It is a happy number.

It is not a de Polignac number, because 1961344399 - 2¹ = 1961344397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961344391) 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, 3849 + ... + 62749.

It is an arithmetic number, because the mean of its divisors is an integer number (144192096).

Almost surely, 2^1961344399 is an apocalyptic number.

1961344399 is a deficient number, since it is larger than the sum of its proper divisors (345729137).

1961344399 is an equidigital number, since it uses as much as digits as its factorization.

1961344399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59046.

The product of its digits is 629856, while the sum is 49.

The square root of 1961344399 is about 44287.0680786164. The cubic root of 1961344399 is about 1251.7510177907.

The spelling of 1961344399 in words is "one billion, nine hundred sixty-one million, three hundred forty-four thousand, three hundred ninety-nine".