139421777 has 16 divisors (see below), whose sum is σ = 163327104. Its totient is φ = 117600000.

The previous prime is 139421767. The next prime is 139421797. The reversal of 139421777 is 777124931.

It is a cyclic number.

It is not a de Polignac number, because 139421777 - 2¹⁸ = 139159633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139421767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8027 + ... + 18527.

It is an arithmetic number, because the mean of its divisors is an integer number (10207944).

Almost surely, 2^139421777 is an apocalyptic number.

139421777 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

139421777 is a deficient number, since it is larger than the sum of its proper divisors (23905327).

139421777 is a wasteful number, since it uses less digits than its factorization.

139421777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600.

The product of its digits is 74088, while the sum is 41.

The square root of 139421777 is about 11807.6999030294. The cubic root of 139421777 is about 518.5335619654.

The spelling of 139421777 in words is "one hundred thirty-nine million, four hundred twenty-one thousand, seven hundred seventy-seven".