1257745398 has 32 divisors (see below), whose sum is σ = 3095990016. Its totient is φ = 331712928.

The previous prime is 1257745393. The next prime is 1257745429. The reversal of 1257745398 is 8935477521.

It is a self number, because there is not a number n which added to its sum of digits gives 1257745398.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257745393) 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, 1151236 + ... + 1152327.

It is an arithmetic number, because the mean of its divisors is an integer number (96749688).

Almost surely, 2^1257745398 is an apocalyptic number.

1257745398 is an abundant number, since it is smaller than the sum of its proper divisors (1838244618).

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

1257745398 is a wasteful number, since it uses less digits than its factorization.

1257745398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303588.

The product of its digits is 2116800, while the sum is 51.

The square root of 1257745398 is about 35464.7063712644. The cubic root of 1257745398 is about 1079.4376925364.

It can be divided in two parts, 12577 and 45398, that added together give a palindrome (57975).

The spelling of 1257745398 in words is "one billion, two hundred fifty-seven million, seven hundred forty-five thousand, three hundred ninety-eight".