1345557890 has 8 divisors (see below), whose sum is σ = 2422004220. Its totient is φ = 538223152.

The previous prime is 1345557859. The next prime is 1345557901. The reversal of 1345557890 is 987555431.

It can be written as a sum of positive squares in 2 ways, for example, as 1345349041 + 208849 = 36679^2 + 457^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67277885 + ... + 67277904.

Almost surely, 2^1345557890 is an apocalyptic number.

1345557890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1345557890 is a deficient number, since it is larger than the sum of its proper divisors (1076446330).

1345557890 is a wasteful number, since it uses less digits than its factorization.

1345557890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134555796.

The product of its (nonzero) digits is 756000, while the sum is 47.

The square root of 1345557890 is about 36681.8468728062. The cubic root of 1345557890 is about 1103.9959047536.

The spelling of 1345557890 in words is "one billion, three hundred forty-five million, five hundred fifty-seven thousand, eight hundred ninety".