1355890 has 8 divisors (see below), whose sum is σ = 2440620. Its totient is φ = 542352.

The previous prime is 1355881. The next prime is 1355891. The reversal of 1355890 is 985531.

It can be written as a sum of positive squares in 2 ways, for example, as 1279161 + 76729 = 1131^2 + 277^2 .

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1355891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67785 + ... + 67804.

2^1355890 is an apocalyptic number.

1355890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1355890 is a deficient number, since it is larger than the sum of its proper divisors (1084730).

1355890 is a wasteful number, since it uses less digits than its factorization.

1355890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135596.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1355890 is about 1164.4268976625. The cubic root of 1355890 is about 110.6814446967.

The spelling of 1355890 in words is "one million, three hundred fifty-five thousand, eight hundred ninety".