1139749 has 8 divisors (see below), whose sum is σ = 1245272. Its totient is φ = 1036800.

The previous prime is 1139741. The next prime is 1139771. The reversal of 1139749 is 9479311.

1139749 = T₂₂₂ + T₂₂₃ + ... + T₂₆₀.

It can be written as a sum of positive squares in 4 ways, for example, as 22500 + 1117249 = 150^2 + 1057^2 .

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 1139749 - 2³ = 1139741 is a prime.

It is a Duffinian number.

1139749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139741) 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, 349 + ... + 1549.

It is an arithmetic number, because the mean of its divisors is an integer number (155659).

2^1139749 is an apocalyptic number.

It is an amenable number.

1139749 is a deficient number, since it is larger than the sum of its proper divisors (105523).

1139749 is a wasteful number, since it uses less digits than its factorization.

1139749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287.

The product of its digits is 6804, while the sum is 34.

The square root of 1139749 is about 1067.5902772131. The cubic root of 1139749 is about 104.4567252883.

The spelling of 1139749 in words is "one million, one hundred thirty-nine thousand, seven hundred forty-nine".