1249439381 has 8 divisors (see below), whose sum is σ = 1253228760. Its totient is φ = 1245657088.

The previous prime is 1249439377. The next prime is 1249439417. The reversal of 1249439381 is 1839349421.

It can be written as a sum of positive squares in 4 ways, for example, as 887146225 + 362293156 = 29785^2 + 19034^2 .

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 1249439381 - 2² = 1249439377 is a prime.

It is a super-2 number, since 2×1249439381² = 3122197533587326322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249438381) 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 7 ways as a sum of consecutive naturals, for example, 660485 + ... + 662373.

It is an arithmetic number, because the mean of its divisors is an integer number (156653595).

Almost surely, 2^1249439381 is an apocalyptic number.

It is an amenable number.

1249439381 is a deficient number, since it is larger than the sum of its proper divisors (3789379).

1249439381 is an equidigital number, since it uses as much as digits as its factorization.

1249439381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3543.

The product of its digits is 186624, while the sum is 44.

The square root of 1249439381 is about 35347.4098202400. The cubic root of 1249439381 is about 1077.0562786648.

The spelling of 1249439381 in words is "one billion, two hundred forty-nine million, four hundred thirty-nine thousand, three hundred eighty-one".