240999381 has 56 divisors (see below), whose sum is σ = 418662720. Its totient is φ = 135815616.

The previous prime is 240999377. The next prime is 240999383. The reversal of 240999381 is 183999042.

It is not a de Polignac number, because 240999381 - 2² = 240999377 is a prime.

It is a super-2 number, since 2×240999381² = 116161403284766322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240999383) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 423265 + ... + 423833.

It is an arithmetic number, because the mean of its divisors is an integer number (7476120).

Almost surely, 2^240999381 is an apocalyptic number.

240999381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

240999381 is a deficient number, since it is larger than the sum of its proper divisors (177663339).

240999381 is an frugal number, since it uses more digits than its factorization.

240999381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 240999381 is about 15524.1547595996. The cubic root of 240999381 is about 622.3078925277.

The spelling of 240999381 in words is "two hundred forty million, nine hundred ninety-nine thousand, three hundred eighty-one".