242689690 has 16 divisors (see below), whose sum is σ = 451905480. Its totient is φ = 93728320.

The previous prime is 242689639. The next prime is 242689693. The reversal of 242689690 is 96986242.

It can be written as a sum of positive squares in 4 ways, for example, as 141063129 + 101626561 = 11877^2 + 10081^2 .

It is a super-2 number, since 2×242689690² = 117796571264592200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 242689690.

It is not an unprimeable number, because it can be changed into a prime (242689693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418141 + ... + 418720.

Almost surely, 2^242689690 is an apocalyptic number.

242689690 is a deficient number, since it is larger than the sum of its proper divisors (209215790).

242689690 is a wasteful number, since it uses less digits than its factorization.

242689690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836897.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 242689690 is about 15578.5008906506. The cubic root of 242689690 is about 623.7594079194.

The spelling of 242689690 in words is "two hundred forty-two million, six hundred eighty-nine thousand, six hundred ninety".