240396381 has 6 divisors (see below), whose sum is σ = 347239230. Its totient is φ = 160264248.

The previous prime is 240396353. The next prime is 240396419. The reversal of 240396381 is 183693042.

240396381 is a `hidden beast` number, since 240 + 39 + 6 + 381 = 666.

It can be written as a sum of positive squares in only one way, i.e., 149670756 + 90725625 = 12234^2 + 9525^2 .

It is not a de Polignac number, because 240396381 - 2²² = 236202077 is a prime.

It is a super-2 number, since 2×240396381² = 115580839995794322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240396301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13355346 + ... + 13355363.

It is an arithmetic number, because the mean of its divisors is an integer number (57873205).

Almost surely, 2^240396381 is an apocalyptic number.

It is an amenable number.

240396381 is a deficient number, since it is larger than the sum of its proper divisors (106842849).

240396381 is a wasteful number, since it uses less digits than its factorization.

240396381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26710715 (or 26710712 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 240396381 is about 15504.7212487036. The cubic root of 240396381 is about 621.7884374384.

The spelling of 240396381 in words is "two hundred forty million, three hundred ninety-six thousand, three hundred eighty-one".