242921660 has 24 divisors (see below), whose sum is σ = 511331856. Its totient is φ = 96940800.

The previous prime is 242921647. The next prime is 242921677. The reversal of 242921660 is 66129242.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5366 + ... + 22685.

It is an arithmetic number, because the mean of its divisors is an integer number (21305494).

Almost surely, 2^242921660 is an apocalyptic number.

242921660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

242921660 is an abundant number, since it is smaller than the sum of its proper divisors (268410196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

242921660 is a wasteful number, since it uses less digits than its factorization.

242921660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28493 (or 28491 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 242921660 is about 15585.9443088958. The cubic root of 242921660 is about 623.9580805447.

It can be divided in two parts, 24292 and 1660, that added together give a palindrome (25952).

The spelling of 242921660 in words is "two hundred forty-two million, nine hundred twenty-one thousand, six hundred sixty".