137780999 has 4 divisors (see below), whose sum is σ = 137861880. Its totient is φ = 137700120.

The previous prime is 137780947. The next prime is 137781029. The reversal of 137780999 is 999087731.

137780999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 137780999 - 2²⁰ = 136732423 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 137780999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137780939) 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, 37829 + ... + 41310.

It is an arithmetic number, because the mean of its divisors is an integer number (34465470).

Almost surely, 2^137780999 is an apocalyptic number.

137780999 is a deficient number, since it is larger than the sum of its proper divisors (80881).

137780999 is an equidigital number, since it uses as much as digits as its factorization.

137780999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80880.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 137780999 is about 11738.0151218168. The cubic root of 137780999 is about 516.4914180990.

The spelling of 137780999 in words is "one hundred thirty-seven million, seven hundred eighty thousand, nine hundred ninety-nine".