1389029157 has 6 divisors (see below), whose sum is σ = 2006375462. Its totient is φ = 926019432.

The previous prime is 1389029123. The next prime is 1389029171. The reversal of 1389029157 is 7519209831.

It can be written as a sum of positive squares in only one way, i.e., 1140683076 + 248346081 = 33774^2 + 15759^2 .

It is not a de Polignac number, because 1389029157 - 2¹² = 1389025061 is a prime.

It is a super-2 number, since 2×1389029157² = 3858803997992261298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389029177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77168278 + ... + 77168295.

Almost surely, 2^1389029157 is an apocalyptic number.

It is an amenable number.

1389029157 is a deficient number, since it is larger than the sum of its proper divisors (617346305).

1389029157 is a wasteful number, since it uses less digits than its factorization.

1389029157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154336579 (or 154336576 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 1389029157 is about 37269.6814716735. The cubic root of 1389029157 is about 1115.7591422441.

The spelling of 1389029157 in words is "one billion, three hundred eighty-nine million, twenty-nine thousand, one hundred fifty-seven".