137904427 has 2 divisors, whose sum is σ = 137904428. Its totient is φ = 137904426.

The previous prime is 137904407. The next prime is 137904433. The reversal of 137904427 is 724409731.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137904427 is a prime.

It is not a weakly prime, because it can be changed into another prime (137904407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68952213 + 68952214.

It is an arithmetic number, because the mean of its divisors is an integer number (68952214).

Almost surely, 2^137904427 is an apocalyptic number.

137904427 is a deficient number, since it is larger than the sum of its proper divisors (1).

137904427 is an equidigital number, since it uses as much as digits as its factorization.

137904427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 137904427 is about 11743.2715628993. The cubic root of 137904427 is about 516.6456011298.

The spelling of 137904427 in words is "one hundred thirty-seven million, nine hundred four thousand, four hundred twenty-seven".