40128959 has 16 divisors (see below), whose sum is σ = 46212768. Its totient is φ = 34516992.

The previous prime is 40128937. The next prime is 40128961. The reversal of 40128959 is 95982104.

It is a cyclic number.

It is not a de Polignac number, because 40128959 - 2¹² = 40124863 is a prime.

It is a super-2 number, since 2×40128959² = 3220666700847362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128989) 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, 22799 + ... + 24495.

It is an arithmetic number, because the mean of its divisors is an integer number (2888298).

Almost surely, 2^40128959 is an apocalyptic number.

40128959 is a deficient number, since it is larger than the sum of its proper divisors (6083809).

40128959 is a wasteful number, since it uses less digits than its factorization.

40128959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 40128959 is about 6334.7422204854. The cubic root of 40128959 is about 342.3623230544.

The spelling of 40128959 in words is "forty million, one hundred twenty-eight thousand, nine hundred fifty-nine".