139969930 has 8 divisors (see below), whose sum is σ = 251945892. Its totient is φ = 55987968.

The previous prime is 139969877. The next prime is 139969931. The reversal of 139969930 is 39969931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 131308681 + 8661249 = 11459^2 + 2943^2 .

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

It is not an unprimeable number, because it can be changed into a prime (139969931) 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, 6998487 + ... + 6998506.

Almost surely, 2^139969930 is an apocalyptic number.

139969930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139969930 is a deficient number, since it is larger than the sum of its proper divisors (111975962).

139969930 is a wasteful number, since it uses less digits than its factorization.

139969930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13997000.

The product of its (nonzero) digits is 354294, while the sum is 49.

The square root of 139969930 is about 11830.8888085384. Note that the first 4 decimals coincide. The cubic root of 139969930 is about 519.2122317380.

Subtracting from 139969930 its reverse (39969931), we obtain a palindrome (99999999).

The spelling of 139969930 in words is "one hundred thirty-nine million, nine hundred sixty-nine thousand, nine hundred thirty".