1257350140 has 48 divisors (see below), whose sum is σ = 2686479264. Its totient is φ = 494208000.

The previous prime is 1257350123. The next prime is 1257350189. The reversal of 1257350140 is 410537521.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1257350099 and 1257350108.

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, 697240 + ... + 699040.

It is an arithmetic number, because the mean of its divisors is an integer number (55968318).

Almost surely, 2^1257350140 is an apocalyptic number.

1257350140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257350140 is an abundant number, since it is smaller than the sum of its proper divisors (1429129124).

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

1257350140 is a wasteful number, since it uses less digits than its factorization.

1257350140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398 (or 2396 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1257350140 is about 35459.1333791451. The cubic root of 1257350140 is about 1079.3246062987.

Adding to 1257350140 its reverse (410537521), we get a palindrome (1667887661).

The spelling of 1257350140 in words is "one billion, two hundred fifty-seven million, three hundred fifty thousand, one hundred forty".