139749817 has 8 divisors (see below), whose sum is σ = 148578624. Its totient is φ = 131150448.

The previous prime is 139749793. The next prime is 139749821. The reversal of 139749817 is 718947931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139749817 is a prime.

It is a super-2 number, since 2×139749817² = 39060022703066978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139749217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56103 + ... + 58540.

It is an arithmetic number, because the mean of its divisors is an integer number (18572328).

Almost surely, 2^139749817 is an apocalyptic number.

It is an amenable number.

139749817 is a deficient number, since it is larger than the sum of its proper divisors (8828807).

139749817 is a wasteful number, since it uses less digits than its factorization.

139749817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114719.

The product of its digits is 381024, while the sum is 49.

The square root of 139749817 is about 11821.5826774591. The cubic root of 139749817 is about 518.9399224839.

It can be divided in two parts, 139 and 749817, that added together give a square (749956 = 866²).

The spelling of 139749817 in words is "one hundred thirty-nine million, seven hundred forty-nine thousand, eight hundred seventeen".