1250720409 has 16 divisors (see below), whose sum is σ = 1697250240. Its totient is φ = 819024960.

The previous prime is 1250720407. The next prime is 1250720411. The reversal of 1250720409 is 9040270521.

It is an interprime number because it is at equal distance from previous prime (1250720407) and next prime (1250720411).

It is not a de Polignac number, because 1250720409 - 2¹ = 1250720407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1250720407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327499 + ... + 331295.

It is an arithmetic number, because the mean of its divisors is an integer number (106078140).

Almost surely, 2^1250720409 is an apocalyptic number.

It is an amenable number.

1250720409 is a deficient number, since it is larger than the sum of its proper divisors (446529831).

1250720409 is a wasteful number, since it uses less digits than its factorization.

1250720409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 1250720409 is about 35365.5257136099. The cubic root of 1250720409 is about 1077.4242484917.

The spelling of 1250720409 in words is "one billion, two hundred fifty million, seven hundred twenty thousand, four hundred nine".