40123398 has 16 divisors (see below), whose sum is σ = 91710720. Its totient is φ = 11463816.

The previous prime is 40123351. The next prime is 40123399. The reversal of 40123398 is 89332104.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40123399) 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, 477618 + ... + 477701.

It is an arithmetic number, because the mean of its divisors is an integer number (5731920).

Almost surely, 2^40123398 is an apocalyptic number.

40123398 is an abundant number, since it is smaller than the sum of its proper divisors (51587322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40123398 is a wasteful number, since it uses less digits than its factorization.

40123398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955331.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 40123398 is about 6334.3032766043. The cubic root of 40123398 is about 342.3465076692.

The spelling of 40123398 in words is "forty million, one hundred twenty-three thousand, three hundred ninety-eight".