40561900 has 36 divisors (see below), whose sum is σ = 90075832. Its totient is φ = 15845760.

The previous prime is 40561897. The next prime is 40561909. The reversal of 40561900 is 916504.

It is a super-2 number, since 2×40561900² = 3290535463220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (40561909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417 + ... + 9016.

Almost surely, 2^40561900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40561900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45037916).

40561900 is an abundant number, since it is smaller than the sum of its proper divisors (49513932).

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

40561900 is a wasteful number, since it uses less digits than its factorization.

40561900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9490 (or 9483 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 40561900 is about 6368.8224971340. The cubic root of 40561900 is about 343.5891412664.

The spelling of 40561900 in words is "forty million, five hundred sixty-one thousand, nine hundred".