1242528390 has 32 divisors (see below), whose sum is σ = 3313409760. Its totient is φ = 331340832.

The previous prime is 1242528347. The next prime is 1242528409. The reversal of 1242528390 is 938252421.

It is a happy number.

1242528390 is a `hidden beast` number, since 1 + 2 + 42 + 528 + 3 + 90 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2300709 + ... + 2301248.

It is an arithmetic number, because the mean of its divisors is an integer number (103544055).

Almost surely, 2^1242528390 is an apocalyptic number.

1242528390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1242528390 is an abundant number, since it is smaller than the sum of its proper divisors (2070881370).

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

1242528390 is a wasteful number, since it uses less digits than its factorization.

1242528390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601973 (or 4601967 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1242528390 is about 35249.5161668923. The cubic root of 1242528390 is about 1075.0667750120.

The spelling of 1242528390 in words is "one billion, two hundred forty-two million, five hundred twenty-eight thousand, three hundred ninety".