1257722323 has 16 divisors (see below), whose sum is σ = 1495420416. Its totient is φ = 1042705440.

The previous prime is 1257722321. The next prime is 1257722327. The reversal of 1257722323 is 3232277521.

It is a cyclic number.

It is not a de Polignac number, because 1257722323 - 2¹ = 1257722321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257722321) 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, 41115 + ... + 64852.

It is an arithmetic number, because the mean of its divisors is an integer number (93463776).

Almost surely, 2^1257722323 is an apocalyptic number.

1257722323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1257722323 is a deficient number, since it is larger than the sum of its proper divisors (237698093).

1257722323 is a wasteful number, since it uses less digits than its factorization.

1257722323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106074.

The product of its digits is 35280, while the sum is 34.

The square root of 1257722323 is about 35464.3810463400. The cubic root of 1257722323 is about 1079.4310912594.

Adding to 1257722323 its reverse (3232277521), we get a palindrome (4489999844).

The spelling of 1257722323 in words is "one billion, two hundred fifty-seven million, seven hundred twenty-two thousand, three hundred twenty-three".