240291891 has 24 divisors (see below), whose sum is σ = 397662720. Its totient is φ = 136966896.

The previous prime is 240291847. The next prime is 240291899. The reversal of 240291891 is 198192042.

It is not a de Polignac number, because 240291891 - 2¹¹ = 240289843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (240291899) 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, 21846 + ... + 30948.

It is an arithmetic number, because the mean of its divisors is an integer number (16569280).

Almost surely, 2^240291891 is an apocalyptic number.

240291891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

240291891 is a deficient number, since it is larger than the sum of its proper divisors (157370829).

240291891 is a wasteful number, since it uses less digits than its factorization.

240291891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9535 (or 9532 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 240291891 is about 15501.3512636802. The cubic root of 240291891 is about 621.6983361244.

The spelling of 240291891 in words is "two hundred forty million, two hundred ninety-one thousand, eight hundred ninety-one".