138361819 has 8 divisors (see below), whose sum is σ = 147088080. Its totient is φ = 129780000.

The previous prime is 138361799. The next prime is 138361823. The reversal of 138361819 is 918163831.

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 138361819 - 2⁵ = 138361787 is a prime.

It is a super-2 number, since 2×138361819² = 38287985913977522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138361829) 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, 34132 + ... + 37969.

It is an arithmetic number, because the mean of its divisors is an integer number (18386010).

Almost surely, 2^138361819 is an apocalyptic number.

138361819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138361819 is a deficient number, since it is larger than the sum of its proper divisors (8726261).

138361819 is a wasteful number, since it uses less digits than its factorization.

138361819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72221.

The product of its digits is 31104, while the sum is 40.

The square root of 138361819 is about 11762.7300827657. The cubic root of 138361819 is about 517.2161624279.

The spelling of 138361819 in words is "one hundred thirty-eight million, three hundred sixty-one thousand, eight hundred nineteen".