1245777890 has 16 divisors (see below), whose sum is σ = 2562743232. Its totient is φ = 427123824.

The previous prime is 1245777881. The next prime is 1245777899. The reversal of 1245777890 is 987775421.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1245777881) and next prime (1245777899).

It is not an unprimeable number, because it can be changed into a prime (1245777899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8898344 + ... + 8898483.

It is an arithmetic number, because the mean of its divisors is an integer number (160171452).

Almost surely, 2^1245777890 is an apocalyptic number.

1245777890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1245777890 is an abundant number, since it is smaller than the sum of its proper divisors (1316965342).

1245777890 is a wasteful number, since it uses less digits than its factorization.

1245777890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17796841.

The product of its (nonzero) digits is 987840, while the sum is 50.

The square root of 1245777890 is about 35295.5789016132. The cubic root of 1245777890 is about 1076.0031422221.

The spelling of 1245777890 in words is "one billion, two hundred forty-five million, seven hundred seventy-seven thousand, eight hundred ninety".