1252721492 has 24 divisors (see below), whose sum is σ = 2392948992. Its totient is φ = 569088000.

The previous prime is 1252721461. The next prime is 1252721507. The reversal of 1252721492 is 2941272521.

It is a super-2 number, since 2×1252721492² = 3138622273037412128, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

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, 78548 + ... + 93140.

It is an arithmetic number, because the mean of its divisors is an integer number (99706208).

Almost surely, 2^1252721492 is an apocalyptic number.

It is an amenable number.

1252721492 is a deficient number, since it is larger than the sum of its proper divisors (1140227500).

1252721492 is a wasteful number, since it uses less digits than its factorization.

1252721492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16559 (or 16557 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 1252721492 is about 35393.8058422657. The cubic root of 1252721492 is about 1077.9985485826.

The spelling of 1252721492 in words is "one billion, two hundred fifty-two million, seven hundred twenty-one thousand, four hundred ninety-two".