40155431 has 4 divisors (see below), whose sum is σ = 40212000. Its totient is φ = 40098864.

The previous prime is 40155407. The next prime is 40155433. The reversal of 40155431 is 13455104.

40155431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40155431 - 2¹⁰ = 40154407 is a prime.

It is a super-2 number, since 2×40155431² = 3224917277591522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40155397 and 40155406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40155433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27206 + ... + 28643.

It is an arithmetic number, because the mean of its divisors is an integer number (10053000).

Almost surely, 2^40155431 is an apocalyptic number.

40155431 is a deficient number, since it is larger than the sum of its proper divisors (56569).

40155431 is an equidigital number, since it uses as much as digits as its factorization.

40155431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56568.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 40155431 is about 6336.8313059446. The cubic root of 40155431 is about 342.4375889264.

The spelling of 40155431 in words is "forty million, one hundred fifty-five thousand, four hundred thirty-one".