1249660428 has 24 divisors (see below), whose sum is σ = 2955819888. Its totient is φ = 410846976.

The previous prime is 1249660427. The next prime is 1249660471. The reversal of 1249660428 is 8240669421.

It is a self number, because there is not a number n which added to its sum of digits gives 1249660428.

It is not an unprimeable number, because it can be changed into a prime (1249660427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712401 + ... + 714152.

It is an arithmetic number, because the mean of its divisors is an integer number (123159162).

Almost surely, 2^1249660428 is an apocalyptic number.

It is an amenable number.

1249660428 is an abundant number, since it is smaller than the sum of its proper divisors (1706159460).

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

1249660428 is a wasteful number, since it uses less digits than its factorization.

1249660428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426633 (or 1426631 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1249660428 is about 35350.5364598615. The cubic root of 1249660428 is about 1077.1197914221.

The spelling of 1249660428 in words is "one billion, two hundred forty-nine million, six hundred sixty thousand, four hundred twenty-eight".