127642639 has 2 divisors, whose sum is σ = 127642640. Its totient is φ = 127642638.

The previous prime is 127642633. The next prime is 127642661. The reversal of 127642639 is 936246721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 127642639 - 2³ = 127642631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127642631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63821319 + 63821320.

It is an arithmetic number, because the mean of its divisors is an integer number (63821320).

Almost surely, 2^127642639 is an apocalyptic number.

127642639 is a deficient number, since it is larger than the sum of its proper divisors (1).

127642639 is an equidigital number, since it uses as much as digits as its factorization.

127642639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 127642639 is about 11297.9041861754. The cubic root of 127642639 is about 503.4989758857.

The spelling of 127642639 in words is "one hundred twenty-seven million, six hundred forty-two thousand, six hundred thirty-nine".