1257438428 has 18 divisors (see below), whose sum is σ = 2296813176. Its totient is φ = 601220928.

The previous prime is 1257438401. The next prime is 1257438433. The reversal of 1257438428 is 8248347521.

It is a super-3 number, since 3×1257438428³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 338276 + ... + 341972.

It is an arithmetic number, because the mean of its divisors is an integer number (127600732).

Almost surely, 2^1257438428 is an apocalyptic number.

It is an amenable number.

1257438428 is a deficient number, since it is larger than the sum of its proper divisors (1039374748).

1257438428 is an frugal number, since it uses more digits than its factorization.

1257438428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7421 (or 3722 counting only the distinct ones).

The product of its digits is 430080, while the sum is 44.

The square root of 1257438428 is about 35460.3782833742. The cubic root of 1257438428 is about 1079.3498682040.

The spelling of 1257438428 in words is "one billion, two hundred fifty-seven million, four hundred thirty-eight thousand, four hundred twenty-eight".