40145851 has 4 divisors (see below), whose sum is σ = 41230912. Its totient is φ = 39060792.

The previous prime is 40145821. The next prime is 40145863. The reversal of 40145851 is 15854104.

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 40145851 - 2¹⁹ = 39621563 is a prime.

It is a super-2 number, since 2×40145851² = 3223378705028402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40145801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542475 + ... + 542548.

It is an arithmetic number, because the mean of its divisors is an integer number (10307728).

Almost surely, 2^40145851 is an apocalyptic number.

40145851 is a deficient number, since it is larger than the sum of its proper divisors (1085061).

40145851 is a wasteful number, since it uses less digits than its factorization.

40145851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085060.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 40145851 is about 6336.0753625569. The cubic root of 40145851 is about 342.4103546442.

Adding to 40145851 its reverse (15854104), we get a palindrome (55999955).

The spelling of 40145851 in words is "forty million, one hundred forty-five thousand, eight hundred fifty-one".