40561998 has 32 divisors (see below), whose sum is σ = 85708800. Its totient is φ = 12761856.

The previous prime is 40561993. The next prime is 40561999. The reversal of 40561998 is 89916504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40561991) 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, 43198 + ... + 44126.

It is an arithmetic number, because the mean of its divisors is an integer number (2678400).

Almost surely, 2^40561998 is an apocalyptic number.

40561998 is an abundant number, since it is smaller than the sum of its proper divisors (45146802).

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

40561998 is a wasteful number, since it uses less digits than its factorization.

40561998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 40561998 is about 6368.8301908592. The cubic root of 40561998 is about 343.5894179769.

The spelling of 40561998 in words is "forty million, five hundred sixty-one thousand, nine hundred ninety-eight".