139001890 has 24 divisors (see below), whose sum is σ = 256485780. Its totient is φ = 54238080.

The previous prime is 139001879. The next prime is 139001909. The reversal of 139001890 is 98100931.

It can be written as a sum of positive squares in 6 ways, for example, as 21040569 + 117961321 = 4587^2 + 10861^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12676 + ... + 20944.

Almost surely, 2^139001890 is an apocalyptic number.

139001890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139001890 is a deficient number, since it is larger than the sum of its proper divisors (117483890).

139001890 is an equidigital number, since it uses as much as digits as its factorization.

139001890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8358 (or 8317 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 139001890 is about 11789.9062761330. The cubic root of 139001890 is about 518.0124945432.

The spelling of 139001890 in words is "one hundred thirty-nine million, one thousand, eight hundred ninety".