1257265422 has 192 divisors, whose sum is σ = 3449986560. Its totient is φ = 337696128.

The previous prime is 1257265421. The next prime is 1257265423. The reversal of 1257265422 is 2245627521.

1257265422 is a `hidden beast` number, since 1 + 2 + 572 + 65 + 4 + 22 = 666.

It is an interprime number because it is at equal distance from previous prime (1257265421) and next prime (1257265423).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257265421) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4442493 + ... + 4442775.

It is an arithmetic number, because the mean of its divisors is an integer number (17968680).

Almost surely, 2^1257265422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1257265422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1724993280).

1257265422 is an abundant number, since it is smaller than the sum of its proper divisors (2192721138).

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

1257265422 is a wasteful number, since it uses less digits than its factorization.

1257265422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 391 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 1257265422 is about 35457.9387725795. The cubic root of 1257265422 is about 1079.3003647681.

The spelling of 1257265422 in words is "one billion, two hundred fifty-seven million, two hundred sixty-five thousand, four hundred twenty-two".