40161290 has 16 divisors (see below), whose sum is σ = 77851368. Its totient is φ = 14828736.

The previous prime is 40161281. The next prime is 40161299. The reversal of 40161290 is 9216104.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40161281) and next prime (40161299).

It can be written as a sum of positive squares in 4 ways, for example, as 14830201 + 25331089 = 3851^2 + 5033^2 .

It is a super-2 number, since 2×40161290² = 3225858428928200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40161299) 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, 154337 + ... + 154596.

Almost surely, 2^40161290 is an apocalyptic number.

40161290 is a deficient number, since it is larger than the sum of its proper divisors (37690078).

40161290 is a wasteful number, since it uses less digits than its factorization.

40161290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308953.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 40161290 is about 6337.2935863821. The cubic root of 40161290 is about 342.4542429149.

Adding to 40161290 its reverse (9216104), we get a palindrome (49377394).

It can be divided in two parts, 40 and 161290, that multiplied together give a square (6451600 = 2540²).

The spelling of 40161290 in words is "forty million, one hundred sixty-one thousand, two hundred ninety".