40148891 has 4 divisors (see below), whose sum is σ = 40465152. Its totient is φ = 39832632.

The previous prime is 40148887. The next prime is 40148897. The reversal of 40148891 is 19884104.

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 40148891 - 2² = 40148887 is a prime.

It is a super-2 number, since 2×40148891² = 3223866897059762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40148897) 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, 157940 + ... + 158193.

It is an arithmetic number, because the mean of its divisors is an integer number (10116288).

Almost surely, 2^40148891 is an apocalyptic number.

40148891 is a deficient number, since it is larger than the sum of its proper divisors (316261).

40148891 is a wasteful number, since it uses less digits than its factorization.

40148891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316260.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 40148891 is about 6336.3152541521. The cubic root of 40148891 is about 342.4189973073.

The spelling of 40148891 in words is "forty million, one hundred forty-eight thousand, eight hundred ninety-one".