40154861 has 2 divisors, whose sum is σ = 40154862. Its totient is φ = 40154860.

The previous prime is 40154843. The next prime is 40154903. The reversal of 40154861 is 16845104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20529961 + 19624900 = 4531^2 + 4430^2 .

It is a cyclic number.

It is not a de Polignac number, because 40154861 - 2¹⁸ = 39892717 is a prime.

It is a super-2 number, since 2×40154861² = 3224825723858642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40154801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20077430 + 20077431.

It is an arithmetic number, because the mean of its divisors is an integer number (20077431).

Almost surely, 2^40154861 is an apocalyptic number.

It is an amenable number.

40154861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40154861 is an equidigital number, since it uses as much as digits as its factorization.

40154861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 40154861 is about 6336.7863306253. The cubic root of 40154861 is about 342.4359686362.

Adding to 40154861 its reverse (16845104), we get a palindrome (56999965).

The spelling of 40154861 in words is "forty million, one hundred fifty-four thousand, eight hundred sixty-one".