1242190258 has 4 divisors (see below), whose sum is σ = 1863285390. Its totient is φ = 621095128.

The previous prime is 1242190249. The next prime is 1242190283. The reversal of 1242190258 is 8520912421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1108024369 + 134165889 = 33287^2 + 11583^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310547563 + ... + 310547566.

Almost surely, 2^1242190258 is an apocalyptic number.

1242190258 is a deficient number, since it is larger than the sum of its proper divisors (621095132).

1242190258 is an equidigital number, since it uses as much as digits as its factorization.

1242190258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621095131.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1242190258 is about 35244.7195761294. The cubic root of 1242190258 is about 1074.9692460645.

The spelling of 1242190258 in words is "one billion, two hundred forty-two million, one hundred ninety thousand, two hundred fifty-eight".