257123007 has 6 divisors (see below), whose sum is σ = 371399912. Its totient is φ = 171415332.

The previous prime is 257122979. The next prime is 257123039. The reversal of 257123007 is 700321752.

It is not a de Polignac number, because 257123007 - 2¹¹ = 257120959 is a prime.

It is a super-2 number, since 2×257123007² = 132224481457444098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257123407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14284603 + ... + 14284620.

Almost surely, 2^257123007 is an apocalyptic number.

257123007 is a deficient number, since it is larger than the sum of its proper divisors (114276905).

257123007 is a wasteful number, since it uses less digits than its factorization.

257123007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28569229 (or 28569226 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 257123007 is about 16035.0555658532. The cubic root of 257123007 is about 635.8875364808.

Adding to 257123007 its reverse (700321752), we get a palindrome (957444759).

The spelling of 257123007 in words is "two hundred fifty-seven million, one hundred twenty-three thousand, seven".