139943290 has 8 divisors (see below), whose sum is σ = 251897940. Its totient is φ = 55977312.

The previous prime is 139943281. The next prime is 139943311. The reversal of 139943290 is 92349931.

It can be written as a sum of positive squares in 2 ways, for example, as 138791961 + 1151329 = 11781^2 + 1073^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6997155 + ... + 6997174.

Almost surely, 2^139943290 is an apocalyptic number.

139943290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139943290 is a deficient number, since it is larger than the sum of its proper divisors (111954650).

139943290 is a wasteful number, since it uses less digits than its factorization.

139943290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13994336.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 139943290 is about 11829.7628885790. The cubic root of 139943290 is about 519.1792896829.

The spelling of 139943290 in words is "one hundred thirty-nine million, nine hundred forty-three thousand, two hundred ninety".