1420389657 has 12 divisors (see below), whose sum is σ = 2052175060. Its totient is φ = 946695168.

The previous prime is 1420389647. The next prime is 1420389701. The reversal of 1420389657 is 7569830241.

1420389657 is digitally balanced in base 10, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 806787216 + 613602441 = 28404^2 + 24771^2 .

It is not a de Polignac number, because 1420389657 - 2⁸ = 1420389401 is a prime.

It is a Duffinian number.

1420389657 is strictly pandigital in base 10.

It is not an unprimeable number, because it can be changed into a prime (1420389617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24969 + ... + 58857.

It is a 1-persistent number, because it is pandigital, but 2⋅1420389657 = 2840779314 is not.

Almost surely, 2^1420389657 is an apocalyptic number.

It is an amenable number.

1420389657 is a deficient number, since it is larger than the sum of its proper divisors (631785403).

1420389657 is a wasteful number, since it uses less digits than its factorization.

1420389657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38552 (or 38549 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 1420389657 is about 37688.0572197613. The cubic root of 1420389657 is about 1124.0936652841.

The spelling of 1420389657 in words is "one billion, four hundred twenty million, three hundred eighty-nine thousand, six hundred fifty-seven".