1249788690 has 80 divisors (see below), whose sum is σ = 3403255680. Its totient is φ = 329041440.

The previous prime is 1249788637. The next prime is 1249788731. The reversal of 1249788690 is 968879421.

1249788690 is a `hidden beast` number, since 12 + 497 + 88 + 69 + 0 = 666.

It is a super-2 number, since 2×1249788690² = 3123943539303832200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54225 + ... + 73755.

It is an arithmetic number, because the mean of its divisors is an integer number (42540696).

Almost surely, 2^1249788690 is an apocalyptic number.

1249788690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1249788690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1701627840).

1249788690 is an abundant number, since it is smaller than the sum of its proper divisors (2153466990).

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

1249788690 is a wasteful number, since it uses less digits than its factorization.

1249788690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19629 (or 19620 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 1249788690 is about 35352.3505583434. The cubic root of 1249788690 is about 1077.1566411159.

The spelling of 1249788690 in words is "one billion, two hundred forty-nine million, seven hundred eighty-eight thousand, six hundred ninety".