1257628214 has 4 divisors (see below), whose sum is σ = 1886442324. Its totient is φ = 628814106.

The previous prime is 1257628139. The next prime is 1257628223. The reversal of 1257628214 is 4128267521.

It is a semiprime because it is the product of two primes.

It is a super-4 number, since 4×1257628214⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314407052 + ... + 314407055.

It is an arithmetic number, because the mean of its divisors is an integer number (471610581).

Almost surely, 2^1257628214 is an apocalyptic number.

1257628214 is a deficient number, since it is larger than the sum of its proper divisors (628814110).

1257628214 is an equidigital number, since it uses as much as digits as its factorization.

1257628214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628814109.

The product of its digits is 53760, while the sum is 38.

The square root of 1257628214 is about 35463.0542113902. The cubic root of 1257628214 is about 1079.4041677983.

The spelling of 1257628214 in words is "one billion, two hundred fifty-seven million, six hundred twenty-eight thousand, two hundred fourteen".