1999581454 has 32 divisors (see below), whose sum is σ = 3323982816. Its totient is φ = 896158080.

The previous prime is 1999581431. The next prime is 1999581481. The reversal of 1999581454 is 4541859991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1999581395 and 1999581404.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 562924 + ... + 566464.

It is an arithmetic number, because the mean of its divisors is an integer number (103874463).

Almost surely, 2^1999581454 is an apocalyptic number.

1999581454 is a deficient number, since it is larger than the sum of its proper divisors (1324401362).

1999581454 is a wasteful number, since it uses less digits than its factorization.

1999581454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180.

The product of its digits is 2332800, while the sum is 55.

The square root of 1999581454 is about 44716.6798186091. The cubic root of 1999581454 is about 1259.8331546106.

The spelling of 1999581454 in words is "one billion, nine hundred ninety-nine million, five hundred eighty-one thousand, four hundred fifty-four".