40561690 has 24 divisors (see below), whose sum is σ = 79062588. Its totient is φ = 14976000.

The previous prime is 40561679. The next prime is 40561699. The reversal of 40561690 is 9616504.

40561690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1661521 + 38900169 = 1289^2 + 6237^2 .

It is a super-2 number, since 2×40561690² = 3290501391312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40561699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10311 + ... + 13690.

Almost surely, 2^40561690 is an apocalyptic number.

40561690 is a deficient number, since it is larger than the sum of its proper divisors (38500898).

40561690 is a wasteful number, since it uses less digits than its factorization.

40561690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24034 (or 24021 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 40561690 is about 6368.8060105486. The cubic root of 40561690 is about 343.5885483139.

It can be divided in two parts, 40 and 561690, that multiplied together give a square (22467600 = 4740²).

The spelling of 40561690 in words is "forty million, five hundred sixty-one thousand, six hundred ninety".