257742093 has 8 divisors (see below), whose sum is σ = 392749888. Its totient is φ = 147281184.

The previous prime is 257742077. The next prime is 257742101. The reversal of 257742093 is 390247752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257742093 - 2⁴ = 257742077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257742013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6136696 + ... + 6136737.

It is an arithmetic number, because the mean of its divisors is an integer number (49093736).

Almost surely, 2^257742093 is an apocalyptic number.

It is an amenable number.

257742093 is a deficient number, since it is larger than the sum of its proper divisors (135007795).

257742093 is a wasteful number, since it uses less digits than its factorization.

257742093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12273443.

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 257742093 is about 16054.3481026169. The cubic root of 257742093 is about 636.3974785855.

The spelling of 257742093 in words is "two hundred fifty-seven million, seven hundred forty-two thousand, ninety-three".