139493902 has 4 divisors (see below), whose sum is σ = 209240856. Its totient is φ = 69746950.

The previous prime is 139493897. The next prime is 139493917. The reversal of 139493902 is 209394931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209394931 = 6761 ⋅30971.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34873474 + ... + 34873477.

It is an arithmetic number, because the mean of its divisors is an integer number (52310214).

Almost surely, 2^139493902 is an apocalyptic number.

139493902 is a deficient number, since it is larger than the sum of its proper divisors (69746954).

139493902 is an equidigital number, since it uses as much as digits as its factorization.

139493902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69746953.

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

The square root of 139493902 is about 11810.7536592717. The cubic root of 139493902 is about 518.6229616434.

The spelling of 139493902 in words is "one hundred thirty-nine million, four hundred ninety-three thousand, nine hundred two".