40155289 has 2 divisors, whose sum is σ = 40155290. Its totient is φ = 40155288.

The previous prime is 40155259. The next prime is 40155301. The reversal of 40155289 is 98255104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40106889 + 48400 = 6333^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 40155289 - 2¹¹ = 40153241 is a prime.

It is a super-2 number, since 2×40155289² = 3224894469347042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40155209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20077644 + 20077645.

It is an arithmetic number, because the mean of its divisors is an integer number (20077645).

Almost surely, 2^40155289 is an apocalyptic number.

It is an amenable number.

40155289 is a deficient number, since it is larger than the sum of its proper divisors (1).

40155289 is an equidigital number, since it uses as much as digits as its factorization.

40155289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 40155289 is about 6336.8201015967. The cubic root of 40155289 is about 342.4371852766.

The spelling of 40155289 in words is "forty million, one hundred fifty-five thousand, two hundred eighty-nine".