137440423 has 2 divisors, whose sum is σ = 137440424. Its totient is φ = 137440422.

The previous prime is 137440417. The next prime is 137440477. The reversal of 137440423 is 324044731.

It is a weak prime.

It is an emirp because it is prime and its reverse (324044731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137440423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 137440391 and 137440400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137440403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68720211 + 68720212.

It is an arithmetic number, because the mean of its divisors is an integer number (68720212).

Almost surely, 2^137440423 is an apocalyptic number.

137440423 is a deficient number, since it is larger than the sum of its proper divisors (1).

137440423 is an equidigital number, since it uses as much as digits as its factorization.

137440423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 137440423 is about 11723.4987525056. The cubic root of 137440423 is about 516.0655013197.

The spelling of 137440423 in words is "one hundred thirty-seven million, four hundred forty thousand, four hundred twenty-three".