139998949 has 4 divisors (see below), whose sum is σ = 140031936. Its totient is φ = 139965964.

The previous prime is 139998857. The next prime is 139998967. The reversal of 139998949 is 949899931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139998949 is a prime.

It is a super-2 number, since 2×139998949² = 39199411442209202, 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 (139998049) 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 3 ways as a sum of consecutive naturals, for example, 8989 + ... + 18994.

It is an arithmetic number, because the mean of its divisors is an integer number (35007984).

Almost surely, 2^139998949 is an apocalyptic number.

It is an amenable number.

139998949 is a deficient number, since it is larger than the sum of its proper divisors (32987).

139998949 is an equidigital number, since it uses as much as digits as its factorization.

139998949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32986.

The product of its digits is 5668704, while the sum is 61.

The square root of 139998949 is about 11832.1151532598. The cubic root of 139998949 is about 519.2481108220.

The spelling of 139998949 in words is "one hundred thirty-nine million, nine hundred ninety-eight thousand, nine hundred forty-nine".