139396290 has 64 divisors (see below), whose sum is σ = 369653760. Its totient is φ = 33359040.

The previous prime is 139396273. The next prime is 139396303. The reversal of 139396290 is 92693931.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23397 + ... + 28743.

It is an arithmetic number, because the mean of its divisors is an integer number (5775840).

Almost surely, 2^139396290 is an apocalyptic number.

139396290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139396290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184826880).

139396290 is an abundant number, since it is smaller than the sum of its proper divisors (230257470).

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

139396290 is a wasteful number, since it uses less digits than its factorization.

139396290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5447.

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 139396290 is about 11806.6206003242. The cubic root of 139396290 is about 518.5019631947.

The spelling of 139396290 in words is "one hundred thirty-nine million, three hundred ninety-six thousand, two hundred ninety".