240699421 has 4 divisors (see below), whose sum is σ = 240730492. Its totient is φ = 240668352.

The previous prime is 240699377. The next prime is 240699451. The reversal of 240699421 is 124996042.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 124996042 = 2 ⋅62498021.

It can be written as a sum of positive squares in 2 ways, for example, as 105884100 + 134815321 = 10290^2 + 11611^2 .

It is a cyclic number.

It is not a de Polignac number, because 240699421 - 2¹⁵ = 240666653 is a prime.

It is a super-2 number, since 2×240699421² = 115872422539470482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240699451) 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 3 ways as a sum of consecutive naturals, for example, 6571 + ... + 22903.

It is an arithmetic number, because the mean of its divisors is an integer number (60182623).

Almost surely, 2^240699421 is an apocalyptic number.

It is an amenable number.

240699421 is a deficient number, since it is larger than the sum of its proper divisors (31071).

240699421 is a wasteful number, since it uses less digits than its factorization.

240699421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31070.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 240699421 is about 15514.4906780725. The cubic root of 240699421 is about 622.0496000603.

The spelling of 240699421 in words is "two hundred forty million, six hundred ninety-nine thousand, four hundred twenty-one".