139743977 has 4 divisors (see below), whose sum is σ = 141829776. Its totient is φ = 137658180.

The previous prime is 139743913. The next prime is 139743983. The reversal of 139743977 is 779347931.

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: 779347931 = 4909 ⋅158759.

It is a cyclic number.

It is not a de Polignac number, because 139743977 - 2⁶ = 139743913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139743997) 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, 1042799 + ... + 1042932.

It is an arithmetic number, because the mean of its divisors is an integer number (35457444).

Almost surely, 2^139743977 is an apocalyptic number.

It is an amenable number.

139743977 is a deficient number, since it is larger than the sum of its proper divisors (2085799).

139743977 is an equidigital number, since it uses as much as digits as its factorization.

139743977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085798.

The product of its digits is 1000188, while the sum is 50.

The square root of 139743977 is about 11821.3356690350. The cubic root of 139743977 is about 518.9326937293.

The spelling of 139743977 in words is "one hundred thirty-nine million, seven hundred forty-three thousand, nine hundred seventy-seven".