1365989157 has 16 divisors (see below), whose sum is σ = 2179356480. Its totient is φ = 840608496.

The previous prime is 1365989129. The next prime is 1365989167. The reversal of 1365989157 is 7519895631.

1365989157 is a `hidden beast` number, since 1 + 36 + 598 + 9 + 15 + 7 = 666.

It is not a de Polignac number, because 1365989157 - 2⁷ = 1365989029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365989167) 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, 1945503 + ... + 1946204.

It is an arithmetic number, because the mean of its divisors is an integer number (136209780).

Almost surely, 2^1365989157 is an apocalyptic number.

It is an amenable number.

1365989157 is a deficient number, since it is larger than the sum of its proper divisors (813367323).

1365989157 is a wasteful number, since it uses less digits than its factorization.

1365989157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3891729 (or 3891723 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The square root of 1365989157 is about 36959.2905370219. The cubic root of 1365989157 is about 1109.5556365960. Note that the first 3 decimals are identical.

The spelling of 1365989157 in words is "one billion, three hundred sixty-five million, nine hundred eighty-nine thousand, one hundred fifty-seven".