40154839 has 2 divisors, whose sum is σ = 40154840. Its totient is φ = 40154838.

The previous prime is 40154813. The next prime is 40154843. The reversal of 40154839 is 93845104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40154839 - 2⁹ = 40154327 is a prime.

It is a super-2 number, since 2×40154839² = 3224822190231842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40154039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20077419 + 20077420.

It is an arithmetic number, because the mean of its divisors is an integer number (20077420).

Almost surely, 2^40154839 is an apocalyptic number.

40154839 is a deficient number, since it is larger than the sum of its proper divisors (1).

40154839 is an equidigital number, since it uses as much as digits as its factorization.

40154839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 40154839 is about 6336.7845947294. The cubic root of 40154839 is about 342.4359060984.

The spelling of 40154839 in words is "forty million, one hundred fifty-four thousand, eight hundred thirty-nine".