1257229939 has 4 divisors (see below), whose sum is σ = 1436834224. Its totient is φ = 1077625656.

The previous prime is 1257229877. The next prime is 1257229969. The reversal of 1257229939 is 9399227521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1257229939 - 2¹³ = 1257221747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1257229892 and 1257229901.

It is not an unprimeable number, because it can be changed into a prime (1257229969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89802132 + ... + 89802145.

It is an arithmetic number, because the mean of its divisors is an integer number (359208556).

Almost surely, 2^1257229939 is an apocalyptic number.

1257229939 is a deficient number, since it is larger than the sum of its proper divisors (179604285).

1257229939 is an equidigital number, since it uses as much as digits as its factorization.

1257229939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179604284.

The product of its digits is 612360, while the sum is 49.

The square root of 1257229939 is about 35457.4384156555. The cubic root of 1257229939 is about 1079.2902112040.

The spelling of 1257229939 in words is "one billion, two hundred fifty-seven million, two hundred twenty-nine thousand, nine hundred thirty-nine".