1250420389 has 2 divisors, whose sum is σ = 1250420390. Its totient is φ = 1250420388.

The previous prime is 1250420387. The next prime is 1250420411. The reversal of 1250420389 is 9830240521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1209996225 + 40424164 = 34785^2 + 6358^2 .

It is a cyclic number.

It is not a de Polignac number, because 1250420389 - 2¹ = 1250420387 is a prime.

It is a super-2 number, since 2×1250420389² = 3127102298453822642, which contains 22 as substring.

Together with 1250420387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1250420387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625210194 + 625210195.

It is an arithmetic number, because the mean of its divisors is an integer number (625210195).

Almost surely, 2^1250420389 is an apocalyptic number.

It is an amenable number.

1250420389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1250420389 is an equidigital number, since it uses as much as digits as its factorization.

1250420389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1250420389 is about 35361.2837578049. The cubic root of 1250420389 is about 1077.3380915668.

The spelling of 1250420389 in words is "one billion, two hundred fifty million, four hundred twenty thousand, three hundred eighty-nine".