1358389991 has 16 divisors (see below), whose sum is σ = 1595897856. Its totient is φ = 1131804576.

The previous prime is 1358389987. The next prime is 1358390017. The reversal of 1358389991 is 1999838531.

It is not a de Polignac number, because 1358389991 - 2² = 1358389987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1358389891) 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, 404180 + ... + 407526.

It is an arithmetic number, because the mean of its divisors is an integer number (99743616).

Almost surely, 2^1358389991 is an apocalyptic number.

1358389991 is a deficient number, since it is larger than the sum of its proper divisors (237507865).

1358389991 is a wasteful number, since it uses less digits than its factorization.

1358389991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4958.

The product of its digits is 2099520, while the sum is 56.

The square root of 1358389991 is about 36856.3426156204. The cubic root of 1358389991 is about 1107.4942777502.

The spelling of 1358389991 in words is "one billion, three hundred fifty-eight million, three hundred eighty-nine thousand, nine hundred ninety-one".