1399257000 has 96 divisors (see below), whose sum is σ = 4729519080. Its totient is φ = 373132800.

The previous prime is 1399256977. The next prime is 1399257001. The reversal of 1399257000 is 7529931.

It can be written as a sum of positive squares in 4 ways, for example, as 836713476 + 562543524 = 28926^2 + 23718^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1399257001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68737 + ... + 86736.

Almost surely, 2^1399257000 is an apocalyptic number.

1399257000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1399257000 is an abundant number, since it is smaller than the sum of its proper divisors (3330262080).

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

1399257000 is a wasteful number, since it uses less digits than its factorization.

1399257000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155500 (or 155483 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 1399257000 is about 37406.6437949196. The cubic root of 1399257000 is about 1118.4910056604.

The spelling of 1399257000 in words is "one billion, three hundred ninety-nine million, two hundred fifty-seven thousand".