40144537 has 2 divisors, whose sum is σ = 40144538. Its totient is φ = 40144536.

The previous prime is 40144529. The next prime is 40144541. The reversal of 40144537 is 73544104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39803481 + 341056 = 6309^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 40144537 - 2³ = 40144529 is a prime.

It is a super-2 number, since 2×40144537² = 3223167701888738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40144547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20072268 + 20072269.

It is an arithmetic number, because the mean of its divisors is an integer number (20072269).

Almost surely, 2^40144537 is an apocalyptic number.

It is an amenable number.

40144537 is a deficient number, since it is larger than the sum of its proper divisors (1).

40144537 is an equidigital number, since it uses as much as digits as its factorization.

40144537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 40144537 is about 6335.9716697599. The cubic root of 40144537 is about 342.4066188317.

The spelling of 40144537 in words is "forty million, one hundred forty-four thousand, five hundred thirty-seven".