139102477 has 4 divisors (see below), whose sum is σ = 146423680. Its totient is φ = 131781276.

The previous prime is 139102441. The next prime is 139102493. The reversal of 139102477 is 774201931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 774201931 = 587 ⋅1318913.

It is a cyclic number.

It is not a de Polignac number, because 139102477 - 2⁷ = 139102349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139102417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3660573 + ... + 3660610.

It is an arithmetic number, because the mean of its divisors is an integer number (36605920).

Almost surely, 2^139102477 is an apocalyptic number.

It is an amenable number.

139102477 is a deficient number, since it is larger than the sum of its proper divisors (7321203).

139102477 is an equidigital number, since it uses as much as digits as its factorization.

139102477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7321202.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 139102477 is about 11794.1713146791. The cubic root of 139102477 is about 518.1374155290.

The spelling of 139102477 in words is "one hundred thirty-nine million, one hundred two thousand, four hundred seventy-seven".