1249700018 has 18 divisors (see below), whose sum is σ = 2181209823. Its totient is φ = 535435740.

The previous prime is 1249700017. The next prime is 1249700021. The reversal of 1249700018 is 8100079421.

It can be written as a sum of positive squares in only one way, i.e., 624850009 + 624850009 = 24997^2 + 24997^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24997.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249700017) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 348173 + ... + 351743.

Almost surely, 2^1249700018 is an apocalyptic number.

1249700018 is a deficient number, since it is larger than the sum of its proper divisors (931509805).

1249700018 is an frugal number, since it uses more digits than its factorization.

1249700018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158 (or 3580 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1249700018 is about 35351.0964186403. The cubic root of 1249700018 is about 1077.1311659047.

Multiplying 1249700018 by its sum of digits (32), we get a square (39990400576 = 199976²).

Adding to 1249700018 its reverse (8100079421), we get a palindrome (9349779439).

The spelling of 1249700018 in words is "one billion, two hundred forty-nine million, seven hundred thousand, eighteen".