139921490 has 16 divisors (see below), whose sum is σ = 252044352. Its totient is φ = 55927344.

The previous prime is 139921487. The next prime is 139921499. The reversal of 139921490 is 94129931.

It is not an unprimeable number, because it can be changed into a prime (139921499) 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, 11717 + ... + 20423.

It is an arithmetic number, because the mean of its divisors is an integer number (15752772).

Almost surely, 2^139921490 is an apocalyptic number.

139921490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139921490 is a deficient number, since it is larger than the sum of its proper divisors (112122862).

139921490 is a wasteful number, since it uses less digits than its factorization.

139921490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10321.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 139921490 is about 11828.8414479187. The cubic root of 139921490 is about 519.1523294852.

The spelling of 139921490 in words is "one hundred thirty-nine million, nine hundred twenty-one thousand, four hundred ninety".