1955408399 has 8 divisors (see below), whose sum is σ = 2235156768. Its totient is φ = 1675761120.

The previous prime is 1955408383. The next prime is 1955408423. The reversal of 1955408399 is 9938045591.

It is a happy number.

It is a Cunningham number, because it is equal to 44220²-1.

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 1955408399 - 2⁴ = 1955408383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1955408399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955408309) 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, 22109 + ... + 66329.

It is an arithmetic number, because the mean of its divisors is an integer number (279394596).

Almost surely, 2^1955408399 is an apocalyptic number.

1955408399 is a deficient number, since it is larger than the sum of its proper divisors (279748369).

1955408399 is an equidigital number, since it uses as much as digits as its factorization.

1955408399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50545.

The product of its (nonzero) digits is 1749600, while the sum is 53.

The square root of 1955408399 is about 44219.9999886929. Note that the first 4 decimals coincide. The cubic root of 1955408399 is about 1250.4869354105.

The spelling of 1955408399 in words is "one billion, nine hundred fifty-five million, four hundred eight thousand, three hundred ninety-nine".