139988490 has 16 divisors (see below), whose sum is σ = 335972448. Its totient is φ = 37330256.

The previous prime is 139988461. The next prime is 139988491. The reversal of 139988490 is 94889931.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139988491) 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, 2333112 + ... + 2333171.

It is an arithmetic number, because the mean of its divisors is an integer number (20998278).

Almost surely, 2^139988490 is an apocalyptic number.

139988490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139988490 is an abundant number, since it is smaller than the sum of its proper divisors (195983958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139988490 is a wasteful number, since it uses less digits than its factorization.

139988490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666293.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 139988490 is about 11831.6731699282. The cubic root of 139988490 is about 519.2351798887.

The spelling of 139988490 in words is "one hundred thirty-nine million, nine hundred eighty-eight thousand, four hundred ninety".