1449779991 has 32 divisors (see below), whose sum is σ = 2169742848. Its totient is φ = 853338240.

The previous prime is 1449779987. The next prime is 1449780019. The reversal of 1449779991 is 1999779441.

It is not a de Polignac number, because 1449779991 - 2² = 1449779987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1449779911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1297365 + ... + 1298481.

It is an arithmetic number, because the mean of its divisors is an integer number (67804464).

Almost surely, 2^1449779991 is an apocalyptic number.

1449779991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1449779991 is a deficient number, since it is larger than the sum of its proper divisors (719962857).

1449779991 is a wasteful number, since it uses less digits than its factorization.

1449779991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231.

The product of its digits is 5143824, while the sum is 60.

The square root of 1449779991 is about 38075.9765600306. The cubic root of 1449779991 is about 1131.7939476767.

The spelling of 1449779991 in words is "one billion, four hundred forty-nine million, seven hundred seventy-nine thousand, nine hundred ninety-one".