1242921290 has 32 divisors (see below), whose sum is σ = 2536168320. Its totient is φ = 434769984.

The previous prime is 1242921283. The next prime is 1242921293. The reversal of 1242921290 is 921292421.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1242921293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249134 + ... + 254073.

It is an arithmetic number, because the mean of its divisors is an integer number (79255260).

Almost surely, 2^1242921290 is an apocalyptic number.

1242921290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1242921290 is an abundant number, since it is smaller than the sum of its proper divisors (1293247030).

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

1242921290 is a wasteful number, since it uses less digits than its factorization.

1242921290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503246.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1242921290 is about 35255.0888525330. The cubic root of 1242921290 is about 1075.1800787201.

The spelling of 1242921290 in words is "one billion, two hundred forty-two million, nine hundred twenty-one thousand, two hundred ninety".