240254991 has 40 divisors (see below), whose sum is σ = 373384704. Its totient is φ = 153789840.

The previous prime is 240254969. The next prime is 240255013. The reversal of 240254991 is 199452042.

240254991 is a `hidden beast` number, since 24 + 0 + 2 + 549 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (240254969) and next prime (240255013).

It is not a de Polignac number, because 240254991 - 2¹⁰ = 240253967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240254951) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 409000 + ... + 409586.

Almost surely, 2^240254991 is an apocalyptic number.

240254991 is a deficient number, since it is larger than the sum of its proper divisors (133129713).

240254991 is a wasteful number, since it uses less digits than its factorization.

240254991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 240254991 is about 15500.1609991638. The cubic root of 240254991 is about 621.6665111595. Note that the first 3 decimals are identical.

The spelling of 240254991 in words is "two hundred forty million, two hundred fifty-four thousand, nine hundred ninety-one".