139999990 has 32 divisors (see below), whose sum is σ = 272051136. Its totient is φ = 51565440.

The previous prime is 139999973. The next prime is 139999991. The reversal of 139999990 is 99999931.

It is a happy number.

139999990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139999991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64320 + ... + 66460.

It is an arithmetic number, because the mean of its divisors is an integer number (8501598).

Almost surely, 2^139999990 is an apocalyptic number.

139999990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139999990 is a deficient number, since it is larger than the sum of its proper divisors (132051146).

139999990 is a wasteful number, since it uses less digits than its factorization.

139999990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664.

The product of its (nonzero) digits is 1594323, while the sum is 58.

The square root of 139999990 is about 11832.1591436221. The cubic root of 139999990 is about 519.2493978220.

The spelling of 139999990 in words is "one hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred ninety".