40531490 has 16 divisors (see below), whose sum is σ = 73778040. Its totient is φ = 16030080.

The previous prime is 40531489. The next prime is 40531523. The reversal of 40531490 is 9413504.

It can be written as a sum of positive squares in 4 ways, for example, as 16216729 + 24314761 = 4027^2 + 4931^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21881 + ... + 23660.

Almost surely, 2^40531490 is an apocalyptic number.

40531490 is a deficient number, since it is larger than the sum of its proper divisors (33246550).

40531490 is a wasteful number, since it uses less digits than its factorization.

40531490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45637.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 40531490 is about 6366.4346380058. The cubic root of 40531490 is about 343.5032547733.

Adding to 40531490 its reverse (9413504), we get a palindrome (49944994).

The spelling of 40531490 in words is "forty million, five hundred thirty-one thousand, four hundred ninety".