1257770397 has 16 divisors (see below), whose sum is σ = 1868307840. Its totient is φ = 747321792.

The previous prime is 1257770383. The next prime is 1257770413. The reversal of 1257770397 is 7930777521.

1257770397 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1257770397 - 2⁶ = 1257770333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257770317) 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, 554913 + ... + 557174.

It is an arithmetic number, because the mean of its divisors is an integer number (116769240).

Almost surely, 2^1257770397 is an apocalyptic number.

It is an amenable number.

1257770397 is a deficient number, since it is larger than the sum of its proper divisors (610537443).

1257770397 is a wasteful number, since it uses less digits than its factorization.

1257770397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112132.

The product of its (nonzero) digits is 648270, while the sum is 48.

The square root of 1257770397 is about 35465.0588185047. The cubic root of 1257770397 is about 1079.4448441385. Note that the first 3 decimals are identical.

The spelling of 1257770397 in words is "one billion, two hundred fifty-seven million, seven hundred seventy thousand, three hundred ninety-seven".