1257910342 has 32 divisors (see below), whose sum is σ = 2245102272. Its totient is φ = 522660864.

The previous prime is 1257910331. The next prime is 1257910369. The reversal of 1257910342 is 2430197521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 1257910298 and 1257910307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51703 + ... + 72034.

It is an arithmetic number, because the mean of its divisors is an integer number (70159446).

Almost surely, 2^1257910342 is an apocalyptic number.

1257910342 is a deficient number, since it is larger than the sum of its proper divisors (987191930).

1257910342 is a wasteful number, since it uses less digits than its factorization.

1257910342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123792.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1257910342 is about 35467.0317619053. The cubic root of 1257910342 is about 1079.4848772285.

The spelling of 1257910342 in words is "one billion, two hundred fifty-seven million, nine hundred ten thousand, three hundred forty-two".