40155389 has 2 divisors, whose sum is σ = 40155390. Its totient is φ = 40155388.

The previous prime is 40155373. The next prime is 40155403. The reversal of 40155389 is 98355104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31832164 + 8323225 = 5642^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 40155389 - 2⁴ = 40155373 is a prime.

It is a super-2 number, since 2×40155389² = 3224910531482642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40155289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20077694 + 20077695.

It is an arithmetic number, because the mean of its divisors is an integer number (20077695).

Almost surely, 2^40155389 is an apocalyptic number.

It is an amenable number.

40155389 is a deficient number, since it is larger than the sum of its proper divisors (1).

40155389 is an equidigital number, since it uses as much as digits as its factorization.

40155389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 40155389 is about 6336.8279919846. The cubic root of 40155389 is about 342.4374695371.

The spelling of 40155389 in words is "forty million, one hundred fifty-five thousand, three hundred eighty-nine".