1054439781 has 8 divisors (see below), whose sum is σ = 1423716480. Its totient is φ = 694061472.

The previous prime is 1054439753. The next prime is 1054439791. The reversal of 1054439781 is 1879344501.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1054439781 - 2¹⁷ = 1054308709 is a prime.

It is a super-2 number, since 2×1054439781² = 2223686503510655922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1054439791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2224320 + ... + 2224793.

It is an arithmetic number, because the mean of its divisors is an integer number (177964560).

Almost surely, 2^1054439781 is an apocalyptic number.

It is an amenable number.

1054439781 is a deficient number, since it is larger than the sum of its proper divisors (369276699).

1054439781 is an equidigital number, since it uses as much as digits as its factorization.

1054439781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449195.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 1054439781 is about 32472.1385344421. The cubic root of 1054439781 is about 1017.8269066120.

The spelling of 1054439781 in words is "one billion, fifty-four million, four hundred thirty-nine thousand, seven hundred eighty-one".