128137957 has 8 divisors (see below), whose sum is σ = 136144800. Its totient is φ = 120257424.

The previous prime is 128137951. The next prime is 128137963. The reversal of 128137957 is 759731821.

It is an interprime number because it is at equal distance from previous prime (128137951) and next prime (128137963).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128137957 - 2³ = 128137949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128137951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29482 + ... + 33547.

It is an arithmetic number, because the mean of its divisors is an integer number (17018100).

Almost surely, 2^128137957 is an apocalyptic number.

It is an amenable number.

128137957 is a deficient number, since it is larger than the sum of its proper divisors (8006843).

128137957 is a wasteful number, since it uses less digits than its factorization.

128137957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63155.

The product of its digits is 105840, while the sum is 43.

The square root of 128137957 is about 11319.8037527159. The cubic root of 128137957 is about 504.1494121667.

The spelling of 128137957 in words is "one hundred twenty-eight million, one hundred thirty-seven thousand, nine hundred fifty-seven".