1257486342 has 32 divisors (see below), whose sum is σ = 2973369600. Its totient is φ = 346892448.

The previous prime is 1257486331. The next prime is 1257486343. The reversal of 1257486342 is 2436847521.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1257486294 and 1257486303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257486343) 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, 514992 + ... + 517427.

It is an arithmetic number, because the mean of its divisors is an integer number (92917800).

Almost surely, 2^1257486342 is an apocalyptic number.

1257486342 is an abundant number, since it is smaller than the sum of its proper divisors (1715883258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1257486342 is a wasteful number, since it uses less digits than its factorization.

1257486342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032460.

The product of its digits is 322560, while the sum is 42.

The square root of 1257486342 is about 35461.0538760483. The cubic root of 1257486342 is about 1079.3635773744.

The spelling of 1257486342 in words is "one billion, two hundred fifty-seven million, four hundred eighty-six thousand, three hundred forty-two".