40261851 has 24 divisors (see below), whose sum is σ = 66634464. Its totient is φ = 22947840.

The previous prime is 40261849. The next prime is 40261873. The reversal of 40261851 is 15816204.

40261851 is a `hidden beast` number, since 40 + 2 + 618 + 5 + 1 = 666.

40261851 is a nontrivial binomial coefficient, being equal to C(8974, 2).

It is not a de Polignac number, because 40261851 - 2¹ = 40261849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40261801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39885 + ... + 40881.

It is an arithmetic number, because the mean of its divisors is an integer number (2776436).

Almost surely, 2^40261851 is an apocalyptic number.

40261851 is the 8973-rd triangular number and also the 4487-th hexagonal number.

40261851 is a deficient number, since it is larger than the sum of its proper divisors (26372613).

40261851 is a wasteful number, since it uses less digits than its factorization.

40261851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651 (or 1648 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 40261851 is about 6345.2226911276. Note that the first 3 decimals coincide. The cubic root of 40261851 is about 342.7398316663.

The spelling of 40261851 in words is "forty million, two hundred sixty-one thousand, eight hundred fifty-one".