138402811 has 4 divisors (see below), whose sum is σ = 139252072. Its totient is φ = 137553552.

The previous prime is 138402793. The next prime is 138402833. The reversal of 138402811 is 118204831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118204831 = 8009 ⋅14759.

It is a cyclic number.

It is not a de Polignac number, because 138402811 - 2⁵ = 138402779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138402811.

It is not an unprimeable number, because it can be changed into a prime (138402871) 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, 424386 + ... + 424711.

It is an arithmetic number, because the mean of its divisors is an integer number (34813018).

Almost surely, 2^138402811 is an apocalyptic number.

138402811 is a deficient number, since it is larger than the sum of its proper divisors (849261).

138402811 is an equidigital number, since it uses as much as digits as its factorization.

138402811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849260.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 138402811 is about 11764.4724063598. The cubic root of 138402811 is about 517.2672353603.

The spelling of 138402811 in words is "one hundred thirty-eight million, four hundred two thousand, eight hundred eleven".