128400357 has 16 divisors (see below), whose sum is σ = 179153408. Its totient is φ = 81699840.

The previous prime is 128400353. The next prime is 128400361. The reversal of 128400357 is 753004821.

It is an interprime number because it is at equal distance from previous prime (128400353) and next prime (128400361).

It is not a de Polignac number, because 128400357 - 2² = 128400353 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 (128400353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2668 + ... + 16245.

It is an arithmetic number, because the mean of its divisors is an integer number (11197088).

Almost surely, 2^128400357 is an apocalyptic number.

It is an amenable number.

128400357 is a deficient number, since it is larger than the sum of its proper divisors (50753051).

128400357 is a wasteful number, since it uses less digits than its factorization.

128400357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19020.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 128400357 is about 11331.3881320869. The cubic root of 128400357 is about 504.4933087279.

The spelling of 128400357 in words is "one hundred twenty-eight million, four hundred thousand, three hundred fifty-seven".