356989 has 2 divisors, whose sum is σ = 356990. Its totient is φ = 356988.

The previous prime is 356981. The next prime is 356999. The reversal of 356989 is 989653.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284089 + 72900 = 533^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 356989 - 2³ = 356981 is a prime.

It is a super-2 number, since 2×356989² = 254882292242, which contains 22 as substring.

356989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (356981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178494 + 178495.

It is an arithmetic number, because the mean of its divisors is an integer number (178495).

2³⁵⁶⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

356989 is a deficient number, since it is larger than the sum of its proper divisors (1).

356989 is an equidigital number, since it uses as much as digits as its factorization.

356989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 356989 is about 597.4855646792. The cubic root of 356989 is about 70.9389808342.

The spelling of 356989 in words is "three hundred fifty-six thousand, nine hundred eighty-nine".