139463821 has 8 divisors (see below), whose sum is σ = 161308224. Its totient is φ = 118099680.

The previous prime is 139463803. The next prime is 139463827. The reversal of 139463821 is 128364931.

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

It is a cyclic number.

It is not a de Polignac number, because 139463821 - 2¹³ = 139455629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139463827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119440 + ... + 120601.

It is an arithmetic number, because the mean of its divisors is an integer number (20163528).

Almost surely, 2^139463821 is an apocalyptic number.

It is an amenable number.

139463821 is a deficient number, since it is larger than the sum of its proper divisors (21844403).

139463821 is an equidigital number, since it uses as much as digits as its factorization.

139463821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240131.

The product of its digits is 31104, while the sum is 37.

The square root of 139463821 is about 11809.4801325037. The cubic root of 139463821 is about 518.5856796820.

The spelling of 139463821 in words is "one hundred thirty-nine million, four hundred sixty-three thousand, eight hundred twenty-one".